• Metamaterials'2019
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15 September 2019 / Start time: 16 h 0 min
16:00 - 19:00 - Sunday registration
16 September 2019 / Start time: 7 h 30 min
07:30 - 08:45 - Monday registration
08:45 - 09:00 - Opening ceremony
09:00 - 10:00 - Plenary session I
09:00 - Plenary session I

Session chairperson(s): Martin Wegener

09:00 - 10:00 - Bulk-Boundary Correspondence in Periodic, Disordered and Aperiodic Topological Meta-Materials Plenary [Show abstract]
  • Emil Prodan, Yeshiva University, USA
<p> Quite often, the bulk-boundary principle is formulated as the emergence of topological boundary modes when a topological meta-material is cut in half. A principle, however, becomes useful when it contains the mechanism that explains the observations made in the statement. Surprisingly, not many are aware that such formulation of the bulk-boundary principle is in fact available. It goes as follows: For each class of the periodic table of topological phases, one can explicitly define a bulk as well as a boundary topological invariant and the two are equal. This statement is applied as it follows: Since the boundary invariant is computed from the boundary modes, a non-zero value of the bulk invariant automatically implies the existence of the boundary modes, because otherwise the boundary invariant, hence also the bulk one, will be zero. In this talk I will demonstrate with plenty of examples how this principle works for the traditional classes of topological meta-materials and how one can easily extend the principle in new settings, such those of quasi-periodic and quasi-crystalline meta-materials.</p>
10:00 - 10:30 - Coffee break (Monday morning)
10:30 - 12:30 - Oral sessions (Monday morning)
10:30 - Special session on topological band gaps in metamaterials (part 1)

Session chairperson(s): Francesco Monticone

10:30 - 11:00 - Odd elasticity Invited oral [Show abstract]
  • Vincenzo Vitelli, The James Franck Institute, USA
Hooke's law states that the forces or stresses experienced by an elastic object are proportional to the applied deformations or strains. The number of coefficients of proportionality between stress and strain, i.e., the elastic moduli, is constrained by energy conservation. In this talk, we lift this restriction and generalize linear elasticity to active media with non-conservative microscopic interactions that violate mechanical reciprocity. This generalized framework, which we dub odd elasticity, reveals that two additional moduli can exist in a two-dimensional isotropic solid with active bonds. Such an odd-elastic solid can be regarded as a distributed engine: work is locally extracted, or injected, during quasi-static cycles of deformation. Using continuum equations, coarse-grained microscopic models, and numerical simulations, we uncover phenomena ranging from activity-induced auxetic behavior to wave propagation powered by self-sustained active elastic cycles. Besides providing insights beyond existing hydrodynamic theories of active solids, odd elasticity suggests design principles for emergent autonomous materials.
11:00 - 11:30 - New Phases of Matter Observed with Architectured Materials: From Higher-Order Topological Insulators to Chiral Landau Levels for Phonons Invited oral [Show abstract]
  • Sebastian Huber, ETH Zurich, Switzerland
  • Valerio Peri, ETH Zurich, Switzerland
  • Marc Serra-Garcia, ETH Zurich, Switzerland
  • Roman Süsstrunk, ETH Zurich, Switzerland
  • Tom Larsen, EPF Lausanne, Switzerland
  • Luis G. Villanueva , EPF Lausanne, Switzerland
  • Osama R. Bilal, Caltech, USA
  • Roni Ilan, Tel Aviv University, Israel
Phonons can serve two interesting purposes. On hand, we can design materials with interesting functionalities such as waveguiding, tailored thermal transport or the processing of classical and quantum information. On the other hand, the high control over fabrication allows us to explore new phases of matter in an efficient way. Here, we are are presenting recent results where we observed the first higher order topological insulator and made use of concepts from high-energy particle physics to create a three-dimensional uni-directional channel
11:30 - 11:45 - Resonant Laser-Beam Scanner based on Topologically Protected Twist Edge-States of Three-Dimensional Chiral Metamaterials Oral [Show abstract]
  • Julian Köpfler, Karlsruhe Institute of Technology, Germany
  • Tobias Frenzel, Karlsruhe Institute of Technology, Germany
  • Muamer Kadic, Karlsruhe Institute of Technology and Université de Bourgogne Franche-Comté, Germany and France
  • Jörg Schmalian, Karlsruhe Institute of Technology, Germany
  • Martin Wegener, Karlsruhe Institute of Technology, Germany
<p> We design a chain of alternating three-dimensional (3D) chiral elastic microstructure cells. The finite chain exhibits topologically protected and hence robust twist edge-states. The arrangement can be used as a scalable resonant mechanical laser-beam scanner.</p>
11:45 - 12:00 - A Two-Dimensional Su-Schrieffer-Heeger Acoustic Network: Experimental Observation of Topological Edge Waves Oral [Show abstract]
  • Liyang Zheng, LAUM, France
  • Vassos Achilleos, LAUM, France
  • Olivier Richoux, LAUM, France
  • Georgios Theocharis, LAUM, France
  • Vincent Pagneux, LAUM, France
<p> We demonstrate experimentally and theoretically an acoustic realisation of 2D SSH model in a simple network. A discrete model is developed to study the sound wave propagation, which leads to the 2D SSH Hamiltonian. By designing an acoustic network, we experimentally observe the existence of topological edge waves.</p>
12:00 - 12:15 - Topological Edge Modes And Elastic Wave Pumping Leveraging Phononics Waveguides Oral [Show abstract]
  • Emanuele Riva, Politecnico di Milano, Italy
  • Matheus Inguaggiato Nora Rosa, Georgia Institute of Technology, United States
  • Massimo Ruzzene, Georgia Institute of Technology, United States
  • Gabriele Cazzulani, Politecnico di Milano, Italy
In this manuscript we report topological pumping in spatially modulated plates. We show that topological edge modes are supported at one boundary, depending on the modulation phase. When this parameter is varied along the second dimension, the edge state transforms from left to right localized, therefore pumping energy from one edge to the other.
12:15 - 12:30 - Feedback Induced Robotic Topological Insulator Oral [Show abstract]
  • Ananya Ghatak, University of Amsterdam, Netherlands
We investigate topological behaviour of a staggered 1-D mass-spring chain added to some external feedback. This type of staggered mass-spring system generally known as Kane-Lubensky (KL) chain and can show topology. With the feedback, the classical system mimics a non-Hermitian quantum system which is of special interest as such systems govern new and exotic physical properties which may or may not have direct analogues in the Hermitian counterparts. We see that the feedback induced KL-chain shows new exotic topological phases which. With the increasing feedback strength, the end states (topological states) switches from left to right and then again right left side on the chain owing to some robotic emergence. This switching is also indicated by the different winding properties of eigenvalues and/or eigenfunctions of the system in its quantum analogue. Our model is simple and can be directly studied in laboratories.
10:30 - Special session on metamaterials and electromagnetic heat transport (part 1)

Session chairperson(s): Juan Carlos Cuevas

10:30 - 11:00 - Flying Micro-Lightsails: Optical Levitation and Propulsion of Nanostructured Ultralight Macroscopic Objects Invited oral [Show abstract]
  • Ognjen Ilic, California Institute of Technology, USA
  • Ramon Gao, California Institute of Technology, USA
  • Cora Went, California Institute of Technology, USA
  • Artur Davoyan, California Institute of Technology, USA
  • Joeson Wong, California Institute of Technology, USA
  • William Whitney, California Institute of Technology, USA
  • Michelle Sherrott, California Institute of Technology, USA
  • Deep Jariwala, California Institute of Technology, USA
  • Michael D. Kelzenberg, California Institute of Technology, USA
  • Harry A. Atwater, California Institute of Technology, USA
We explore nanophotonic design of materials, thermal management, and self-stabilizing optical manipulation, levitation and propulsion of lightweight macroscopic (i.e., mm, cm, or even meter-scale) micro-lightsails via radiation pressure. We consider the materials characteristics required to realize robust, thermally stable building blocks, and find that stable trajectories for dynamic motion of macro-objects can be achieved by controlling the anisotropy of light scattering along the object surface.
11:00 - 11:30 - Plasmonic Photodetector driven by Plasmonic Local Heat Invited oral [Show abstract]
  • Wakana Kubo, Tokyo University of Agriculture and Technology, Japan
We propose a new type of plsmonic photodetector driven by plasmonic local heat. Plasmonic photo-thermoelectric effect is one of the photoelectric conversion that plasmonic local heat is converted into electric current via Seebeck effect of a thermoelectric material.
11:30 - 12:00 - An ultra-thin colored textile for dual-mode radiative heating Invited oral [Show abstract]
  • Min Qiu, Westlake University, China
Personal thermal management, especially heating up the space around human body, consumes a huge amount of global resources. While traditional methods (such as room heaters) for personal heating are mostly energy-wasting and eco-unfriendly, ultra-thin textile with localized heating ability has recently gained significant attention. To date, passive radiative heating textiles are designed exclusively for indoor scenario and the coloration remains challenging. Herein, we report a colored nanophotonic structure textile (~16 μm thickness) with localized heating ability for both indoor and outdoor environments: (a) active heating by selectively absorbing sunlight and turning it into heat (maximum absorbance ~ 50%) and (b) passive heating by suppressing radiative heat loss with a low-emissivity outer surface (infrared emissivity ~ 10%). This textile enables a 3.8°C temperature enhancement of the artificial skin in indoor environment and a 6.3°C temperature enhancement under sunlight compared with 2-mm-thick black sweatshirt, as well as excellent aesthetics, wearability and manufacturability. This colored textile with simultaneous active and passive heating abilities is effective for personal thermal management, and paves an innovative way to the sustainable development of society.
12:00 - 12:30 - Passive Photonic Thermostat: Radiative Thermal Management in Phase-Change Nanostructures Extended oral [Show abstract]
  • Wilton Kort-Kamp, Los Alamos National Laboratory, USA
  • Shobita Kramadhati, Los Alamos National Laboratory, USA
  • Abul Azad, Los Alamos National Laboratory, USA
  • Matthew Reiten, Los Alamos National Laboratory, USA
  • Diego Dalvit, Los Alamos National Laboratory, USA
We propose a passive radiative thermostat based on phase-change photonic nanostructures for thermal regulation at room temperature. By self-adjusting their visible to mid-IR absorptivity and emissivity responses depending on the environment temperature, the proposed devices use the sky to cool or heat with respect to ambient, maintaining an equilibrium temperature approximately locked within the phase transition region.
10:30 - Active and Non-Hermitian systems

Session chairperson(s): Vincenzo Galdi

10:30 - 10:45 - Spectral Singularities in Non-Hermitian Cylindrical Geometries Oral [Show abstract]
  • Massimo Moccia, University of Sannio, Italy
  • Giuseppe Castaldi, University of Sannio, Italy
  • Andrea Alù, City University of New York, USA
  • Vincenzo Galdi, University of Sannio, Italy
Spectral singularities are zero-width resonances associated to real-frequency poles in the scattering operator, which can occur in non-Hermitian structures characterized by suitable spatial distributions of gain and loss. Here, we study this phenomenon in connection with cylindrical structures, and address its exploitation for the tailoring and control of the scattering response.
10:45 - 11:00 - Active Polarization and Wave Front Control of Terahertz Waves Using Graphene Metasurfaces Oral [Show abstract]
  • Haoyang Zhou, Department of physics, Fudan University, China
Although metasurface has offered a new way of controlling the Terahertz (THz) waves, it is still a big challenge to achieve practical meta-devices with tunable functionalizes. Here, we present gated-controlled ultrathin graphene metasurface with switchable reflection polarization and propagating direction in the THz regime (with working frequency 0.37 THz). Such a flexible control is enabled by using meta-atoms with tunable polarization conversion rate (PCR) as the building blocks, so that both phase and polarization state of the total reflected waves can be controlled by graphene gate-voltage. Our proposal set a solid platform for the THz wave manipulation devices, and can be populated to various applications, such as active tunable meta-lenses, vortex phase plates and dynamic holography.
11:00 - 11:15 - Scattering of Partially Coherent Radiation From PT-Symmetric 1D Periodic Structures Oral [Show abstract]
  • Solange Bessa Cavalcanti, Instituto de Física, Universidade Federal de Alagoas, Brazil
  • Paulo Brandão, Instituto de Física, Universidade Federal de Alagoas, Brazil
Recently, a new class of artificial optical materials based on media with a balance between loss an gain regions has been pursued intensely both theoretically and experimentally, due to the notion of parity-time (PT) symmetric structures, that is, a system that is invariant under the simultaneous symmetry transformations of spatial inversion and time reversal. Translated into optics, within the context of Helmholtz equation, it means that the complex refractive index satisfies the condition, n(r) = n*(−r). However, all the studies up to now have not exploited the random nature of the optical field and how it may influence the scattering process. Therefore, here, we have generalized the study of scattering of partially coherent radiation from a periodic system, to a particular one that happens to be invariant under the action of PT symmetry operation. The far-field spectral density profiles illustrate the strong dependency on the gain/loss profile of the scatterer. They exhibit partial absence of grating diffraction order when the coherence degree is high. Otherwise, i.e, in case of low coherence the diffraction order disappears.
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11:15 - 11:30 - Coherent Control of Scattering in Non-Hermitian PT-Symmetrical Systems Oral [Show abstract]
  • Zarko Sakotic, University of Novi Sad, Serbia
  • Alex Krasnok, CUNY Advanced Science Research Center, United States
  • Norbert Cselyuszka, University of Novi Sad, Serbia
  • Nikolina Jankovic, University of Novi Sad, Serbia
  • Andrea Alú, CUNY Advanced Science Research Center, United States
<p> Concepts of coherent perfect absorption, i.e., the time-reversed laser and coherent virtual absorption, are capable of all-optical light manipulation. In this work, we demonstrate how the concept of coherent excitation can pave the way to light scattering control in an extreme fashion in non-Hermitian PT-symmetrical systems supporting an embedded eigenstate.</p>
11:30 - 12:00 - Dielectric Nanoantennas And Metasurfaces With Active And Tunable Functionalities Invited oral [Show abstract]
  • Arseniy Kuznetsov, Institute of Materials Research and Engineering, A*STAR, Singapore
Two new paradigms in the field of dielectric nanoantennas and metasurfaces will be discussed. The first is based on active nanoantennas, made of active semiconductor materials, which can efficiently emit light and shape the emission directivity. This can be used to achieve directional nanoscale lasers and enhanced LEDs. The second is based on embedding the nanoantennas inside a tunable liquid crystal medium, which allows to dynamically tune the nanoantenna resonances and achieve dynamic wavefront control by addressing individual nanoantenna pixels.
12:00 - 12:30 - Active Dielectric And Plasmonic Optical Antennas Invited oral [Show abstract]
  • Till Leuteritz, Universität Bonn, Germany
  • Siqi Qiao, Universität Bonn, Deutschland
  • Manuel Peter, Universität Bonn, Germany
  • Stefan Linden, Universität Bonn, Germany
Optical antennas can be used to modify the radiation properties of nearby quantum emitters. Here, we demonstrate highly directional emission from dielectric optical antennas and report on fluorescence enhancement by a dark plasmon mode.
10:30 - Antenna and absorber applications

Session chairperson(s): Alex Schuchinsky

10:30 - 10:45 - Quasi-isotropic Huygens resonant scatterer in microwaves Oral [Show abstract]
  • Ana C. Escobar, Universidad Nacional de Colombia, Colombia
  • Andrey Sayanskiy, ITMO, Russia
  • Javier L Araque-Quijano, Universidad Nacional de Colombia, Colombia
  • Stanislav B. Glybovski, ITMO, Russia
  • Juan D. Baena, Universidad Nacional de Colombia, Colombia
We have designed two Huygens scatterers based on two laterally shifted split ring resonators. The first one acts as a Huygens scatterer under one direction of an incident plane wave, and the other is approximately independent of the relative direction of the incident electromagnetic field. The bistatic radar cross section of both scatterers is close to the one of an ideal Huygens source in a range of frequencies from 8 GHz to 9 GHz where the response of both scatterers is resonant.
10:45 - 11:00 - High Gain Resonant Cavity Antenna Integrated with Frequency Selective Surface Radome Absorber Oral [Show abstract]
  • Subekti Ari Santoso, The Sirindhron International Thai-German Graduate School of Engineering, King Mongkut’s University of Technology North Bangkok; Institute High Frequency of Technology, RWTH Aachen University, Thailand
  • Sofian Hamid , Institute High Frequency of Technology, RWTH Aachen University, Germany
  • Suramate Chalermwisutkul , The Sirindhron International Thai-German Graduate School of Engineering, King Mongkut’s University of Technology North Bangkok, Thailand
  • Dirk Heberling , Institute High Frequency of Technology, RWTH Aachen University; Fraunhofer Institute for High Frequency Physics and Radar Techniques (FHR), Wachtberg, Germany
<p> A high gain resonance cavity antenna (RCA), integrated with a frequency selective surface (FSS) radome absorber is presented. The RCA has a U-slot microstrip patch antenna (MPA) as the primary source. The cavity resonance is generated by the large ground plane and a single layer of partially reflective structure (PRS) as the superstrate, which is placed at a distance of a half-wavelength from the ground plane. The PRS consists of 12 x 12 square patch arrays. Integration with an FSS radome absorber is performed to create a high gain and low scattering functional antenna. The impact of this integration to the antenna performance is investigated. The input reflection coefficient, realized gain and radiation pattern are compared. They are relatively similar, without and with the FSS radome absorber. A slight increase in the realized gain is expected due to the contribution of the metallic FSS structure since the FSS structure is treated as the second PRS layer for the RCA in the integration.</p>
11:00 - 11:15 - Antenna Applications Based on Waveform-Selective Metasurfaces Varying Time-Domain Responses at the Same Frequency Oral [Show abstract]
  • Hiroki Wakatsuchi, Nagoya Institute of Technology, Japan
  • Daiju Ushikoshi, Nagoya Institute of Technology, Japan
  • Suhair M. Mahmood, Nagoya Institute of Technology, Japan
We demonstrate several examples of antenna applications using recently reported waveform-selective metasurfaces, which vary their electromagnetic responses to an incident wave even at the same frequency, depending on the waveform or pulse width.
11:15 - 11:30 - Superdirective Antennas of Coupled Helical Elements Oral [Show abstract]
  • Pavel Petrov, University of Exeter, Department of Physics and Astronomy, United Kingdom
  • Alastair Hibbins, University of Exeter, Department of Physics and Astronomy, United Kingdom
  • Roy Sambles, University of Exeter, Department of Physics and Astronomy, United Kingdom
Using magnetically-coupled structures formed of subwavelength metallic helices, we demonstrate superdirective end-fire radiation in the low GHz frequency range. Numerical, experimental and analytical results are presented on superdirective dimers that are almost three times smaller compared to previously demonstrated dimers of split-ring-resonators (0.09λ compared with 0.25λ). Optimisation of such structures in terms of their size, directivity, efficiency and operational passband is demonstrated.
11:30 - 11:45 - Using Passive Phase Shifters to Suppress Grating Lobes in Metasurface Antenna Arrays Oral [Show abstract]
  • Michael Boyarsky, Duke University, USA
  • Mohammadreza F. Imani, Duke University, USA
  • David Smith, Duke University, USA
Metasurface antennas are lightweight and low-cost electronically steered antennas. Lorentzian metamaterial elements can lead to strong grating lobes when applying traditional antenna design methods and tuning strategies. We describe how using passive phase shifters to scramble the incident phase of a series of waveguides can suppress grating lobes.
11:45 - 12:00 - Topological Design for Antenna Pattern Shaping Oral [Show abstract]
  • Mirko Barbuto, Niccolò Cusano University, Italy
  • M.-A. Miri, City University of New York, USA
  • Andrea Alù, City University of New York, USA
  • Filiberto Bilotti, Roma Tre University, Isaly
  • Alessandro Toscano, Roma Tre University, Italy
Some recent works have demonstrated that phase singularities of vortex fields can find different applications at microwave frequencies. In particular, it has been shown that topological properties of phase singularity points can be used to design patch antennas with reconfigurable radiation characteristics. The aim of this contribution is to generalize the aforementioned approach and, thus, to present a general design tool for antenna pattern shaping based on topological properties of vortex modes.
12:00 - 12:30 - Metamaterial-inspired Solution to Lackluster On-Chip Antenna Performance Invited oral [Show abstract]
  • Richard Ziolkowski, University of Technology Sydney, Australia
An electric or magnetic dipole antenna located on the interface between a low and high permittivity dielectric faces the problem that the physics tells us that the majority of the power it emits will be radiated into the high dielectric region. This effect is a significant problem for an on-chip antenna associated with systems-on-chip applications such as mobile computing and embedded systems. It is demonstrated that one can use metamaterial-inspired Huygens antennas to overcome this very practical problem.
12:30 - 14:00 - Lunch break (Monday)
14:00 - 15:30 - Oral sessions (Monday - afternoon 1)
14:00 - Plasmonics (part 1)

Session chairperson(s): Dorota Anna Pawlak

14:00 - 14:15 - Controlling the direction of propagation of surface plasmons via graded index effective dielectric media Oral [Show abstract]
  • Victor Pacheco Pena, Newcastle University, United Kingdom
  • Miguel Beruete, Universidad Publica de Navarra, Spain
We propose a mechanism to tailor surface plasmon (SP) propagation by using graded index concepts. A block of dielectric with fixed thickness is placed on top of a semi-infinite metal. The steerers are designed by changing the height of the dielectric in the direction perpendicular to the propagation axis. The analytical design is presented and several structures are evaluated with the ability to steer the incoming SP’s at any desired output angle.
14:15 - 14:30 - Babinet’s Principle for Plasmonic Antennas with Electric and Magnetic Response Oral [Show abstract]
  • Vlastimil Křápek, Brno University of Technology, Czech Republic
  • Michal Horák, Brno University of Technology, Czech Republic
  • Martin Hrtoň, Brno University of Technology, Czech Republic
  • Andrea Konečná, Materials Physics Center, Spain
  • Michael Stöger-Pollach, Vienna University of Technology, Austria
  • Filip Ligmajer, Brno University of Technology, Czech Republic
  • Tomáš Šikola, Brno University of Technology, Czech Republic
We present a study of Babinet's principle of complementarity in plasmonics. We discuss the electric and magnetic component of the near field related to solid and hollow antennas and their imaging with electron energy loss spectroscopy. Next, we combine bow-tie and diabolo duality and Babinet’s principle to design antennas with electric and magnetic hot spots.
14:30 - 15:00 - Metamaterials for All-optical Metrology with Atomic Scale Resolution Extended oral [Show abstract]
  • Nikolay Zheludev, University of Southampton and NTU Singapore, United Kingdom
  • Guang Hui Yuan, Nanyang Technological University, Singapore
We introduce “optical ruler”, an electromagnetic analogue of physical ruler. It is a metamaterial structure that simultaneously generates electromagnetic field structured with singularities at the deeply sub-wavelength scale and reveals them for displacement metrology with resolution of ~ λ/1000.
15:00 - 15:15 - Imaging Degenerate States In Plasmonic Nanoparticles With Nanometer Resolution Oral [Show abstract]
  • Viktor Myroshnychenko, Paderborn University, Germany
  • Natsuki Nishio, Tokyo Institute of Technology, Japan
  • F. Javier García de Abajo, ICFO-Institut de Ciencies Fotoniques, Spain
  • Naoki Yamamoto, Tokyo Institute of Technology, Japan
  • Jens Förstner, Paderborn University, Germany
We demonstrate that the combination of the angle- and polarization-resolved cathodoluminescence provides a powerful technique with ability to detect and image degenerate, weakly radiative, and dark localized plasmon modes in gold nanoprisms with nanometer resolution. Our approach introduces systematics for a comprehensive symmetry characterization of plasmonic states in high-symmetry nanostructures.
15:15 - 15:30 - Influence of nonlocality in metallo-dielectric structures with high permittivity dielectrics Oral [Show abstract]
  • Antoine Moreau, Université Clermont Auvergne, France
  • Armel Pitelet, Université Clermont Auvergne, France
  • Emmanuel Centeno, Université Clermont Auvergne, France
  • Nikolai Schmitt, INRIA, France
  • Claire Scheid, Université Nice Côte d'Azur, France
  • Dimitrios Loukresis, Technische Universität Darmstadt, Germany
  • Herbert De Gersem, Technische Universität Darmstadt, Germany
  • Cristian Ciraci, Italian Institute of Technology, Italy
Spatial dispersion in metals has an impact on many different guided modes in plas\-mo\-nics, like the gap plasmon. Most often, the hydrodynamic model is used to describe this impact. In this framework, we show that when an interface between a noble metal and a high permittivity medium is considered, the surface plasmon is actually sensitive to nonlocality. This means that nanoparticles with any size can be expected to be sensitive too, as well as metallic gratings allowing to excite such modes. We show that nonlocality can be studied and the parameters of the hydrodynamic model retrieved by considering an experiment very close to Wood's seminal experiment of the beginning of the twentieth century.
14:00 - RF and microwave metamaterials (part 1)

Session chairperson(s): Christopher Stevens

14:00 - 14:15 - A Meta-Material Position Sensor Based on Magneto-Inductive Waves Oral [Show abstract]
  • Jiaruo Yan, Oxford University, United Kingdom
  • Christopher Stevens, Oxford University, UK
  • Ekaterina Shamonina, Oxford University, UK
<p> Abstract – In this paper we report our first investigations of a new type of position sensor based on the propagation of metamaterial waves. Using knowledge of magnetoinductive waves in a one dimensional metamaterial we are able to unambiguously localise an object which impinges on the near field of the metamaterial structure. Key performance metrics are investigated and the ultimate range of the sensor is limited only by the metamaterial’s quality factor</p>
14:15 - 14:30 - Realization of Achromatic Microwave Metasurface Lenses Oral [Show abstract]
  • Ashif Aminulloh Fathnan, University of New South Wales, Canberra, Australia
  • David Powell, University of New South Wales, Canberra, Australia
Achromatic metasurfaces have shown promising features whereby a constant wave-manipulation function can be implemented in a wide bandwidth of operation. Despite ample works on achieving achromatism using metasurfaces, there is a question of how far a metasurface can maintain broadband constant operation. Based on common three metallic layers of a transmission-type metasurface, we previously derived a physical limit, showing that there is a trade-off relation between metasurface aperture size and bandwidth. Here, we verify these findings, using an analytical study of two different metasurface lenses.
14:30 - 14:45 - Non-Ideal 'Negation' of Complex Load In Self-Oscillating Non-Foster Structures Oral [Show abstract]
  • Leo Vincelj, Faculty of electrical engineering and computing, Zagreb, Croatia
  • Silvio Hrabar, Faculty of electrical engineering and computing, Zagreb, Croatia
  • Igor Krois, Faculty of electrical engineering and computing, Zagreb, Croatia
<p> Recent introduction of self-oscillating non-Foster structures prompted the need of 'negation' of a complex load via Negative Impedance Converter (NIC). In the paper, we investigate conversion error of a complex network that mimics an antenna, embedded in a unit cell of a self-oscillating non-Foster metasurface.</p>
14:45 - 15:00 - Design of WideBand Transmission Polarization Converters Oral [Show abstract]
  • Filippo Costa, University of Pisa, Italy
  • Michele Borgese, GreenWaves s.r.l., Italy
A designing tool for wideband transmission polarization converting surfaces is presented. The optimized wideband polarizer comprises several metasurface layers whose unit cell is gradually rotated. The analysis is based on an analytical transmission line model of the multilayer structure with anisotropic elements.
15:00 - 15:15 - Microwave Waveguides Loaded with Dielectric Metasurfaces Oral [Show abstract]
  • Dimitrios Zografopoulos, Istituto per la Microelettronica e Microsistemi, Italy
  • José Francisco Algorri, Carlos III University of Madrid, Spain
  • Antonio Ferraro, Istituto per la Microelettronica e Microsistemi, Italy
  • Braulio García-Cámara, Carlos III University of Madrid, Spain
  • José Manuel Sánchez Pena, Carlos III University of Madrid - Department of Electronic Technology, Spain
  • Romeo Beccherelli, Istituto per la Microelettronica e Microsistemi, Italy
<p> We theoretically propose the concept of loading microwave waveguides with periodic arrays of dielectric elements that emulate the electromagnetic response of two-dimensional metasurfaces. It is demonstrated that parallel-plate and rectangular waveguides retain almost the same properties at the resonant frequency resonance, while the main attributes are also preserved in standard microstrip lines.</p>
15:15 - 15:30 - Toward Sensing and Imaging in Indoor Environments Using Dynamic Metasurface Apertures Oral [Show abstract]
  • Oren Mizrahi, Duke University, USA
  • Mohammadreza F. Imani, Duke University, United States
  • David Smith, Duke University, USA
We propose dynamic metasurface apertures as a novel hardware for sensing objects/events inside a room. The DMA has a single port that feed a planar cavity exciting an array of reconfigurable metamaterial radiators. It can generate a multitude of spatially distinct patterns that realizes desired spatial diversity for sensing applications.
14:00 - Fabrication and experiment (part 1)

Session chairperson(s): Stefan Linden

14:00 - 14:15 - Broadband Dielectric Metasurfaces Using Ceramic Stereolithography Oral [Show abstract]
  • Steve Young, University of Michigan, USA
  • Luke Szymanski, University of Michigan, USA
  • Anthony Grbic, University of Michigan, USA
A broadband half-wave plate is demonstrated based on cascaded alumina/air subwavelength gratings. Stacked subwavelength gratings can be well-approximated by homogeneous anistropic layers, permitting analysis by plane wave transfer matrix techniques and rapid design optimization. The example waveplate, fabricated using ceramic stereolithography, shows broadband phase performance and low loss over the Ka frequency band (26.5 -- 40 GHz). Analytic calculations show excellent agreement with measured reflection coefficients, validating the design approach.
14:15 - 14:30 - Visualization of isofrequency contours of guided modes in all-dielectric hyperbolic-likemetasurface Oral [Show abstract]
  • Dmitry Pidgayko, ITMO University, Russia
  • Ivan Sinev, ITMO University, Russia
  • Dmitry Permyakov$, ITMO University, Russia
  • Stanyslav Sychev, ITMO University, Russia
  • Frank Heyroth, Martin Luther University Halle-Wittenberg, Germany
  • Viktoriia Rutckaia, Martin Luther University Halle-Wittenberg, Germany
  • Joerg Schilling, Martin Luther University Halle-Wittenberg, Germany
  • Andrei Lavrinenko, Technical University of Denmark, Denmark
  • Andrey Bogdanov, ITMO University, Russia
  • Anton Samusev, ITMO University, Russia
We designed a SOI-based all-dielectric anisotropic metasurface which supports both hyperbolic-like and elliptic dispersion regimes of guided modes. We employ back focal plane microscope with solid immersion lens for visualization of isofrequency contours in visible and near infrared ranges and reconstruct the full dispersion
14:30 - 14:45 - Imaging of High-Frequency Motion in Artificial Nanostructures Oral [Show abstract]
  • Tongjun Liu, University of Southampton, United Kingdom
  • Jun-Yu Ou, University of Southampton, United Kingdom
  • Kevin MacDonald, University of Southampton, United Kingdom
  • Nikolay Zheludev, University of Southampton, United Kingdom
The development of nanomechanical photonic metamaterials and devices demands characterisation of fast movements typically picometer amplitude at MHz-GHz frequencies. Here we report on a new approach to the visualization of nanoscale movements based on the detection of secondary electrons and photons emerging from the interaction of focused electron beam with moving components of the nano-object, where the motion is activated thermally, or by external forces.
14:45 - 15:00 - Three-Dimensional Structuring of Metasurfaces No show [Show abstract]
  • Antonio Tricoli, Nanotechnology Research Laboratory, Australian National University, Australia
Nanostructured materials have the potential to significantly enhance the performance of electronic devices as recently demonstrated for chemical sensors, batteries, and photodetectors. This has resulted in a gold rush toward novel applications ranging from flexible electronics to wearable nanogenerators. Despite these achievements, integration of nanomaterials in devices is challenging, and their assembly in suboptimal structures, lacking of hierarchical design, drastically limit the final performance. Here, we will present the fabrication of highly performing optical gas sensors by the multi-scale engineering of nanoparticle networks on Au metasurfaces (Figure 1). We will showcase the use of scalable and low cost synthesis approaches for the wafer-level fabrication of tailored and well-reproducible 3D morphologies of multi-functional nanoclusters. We will conclude with recent achievements [1] in the nanofabrication of semiconductor-plasmonic nanoparticle structures for localized surface plasmon resonance and chemical sensing.
15:00 - 15:30 - 3D Antennas and Metamaterials with Additive Manufacturing Invited oral [Show abstract]
  • Yiannis Vardaxoglou, Symeta Research Centre, Loughborough University, United Kingdom
<p> PThis paper presents several demonstrators that utilize advanced additive manufacturing (AM) to rapidly prototype antennas, RF components for microwave and mm-wave applications. Antenna with integrated tailored permittivity dielectrics, metamaterials and high-performance ceramic materials can be fabricated by using extrusion based AM processes to realize low loss and high gain antenna systems with low material cost and time-saving manufacturing process.ut your abstract here</p>
14:00 - Transformational approaches

Session chairperson(s): Muamer Kadic

14:00 - 14:30 - Nonlocal and Non-Hermitian Transformation Optics Invited oral [Show abstract]
  • Massimo Moccia, University of Sannio, Italy
  • Giuseppe Castaldi, University of Sannio, Italy
  • Vincenzo Galdi, University of Sannio, Italy
Conventional transformation optics is based on real-valued spatial coordinate transformations which cannot naturally handle nonlocal (spatial dispersion) and gain/loss ef- fects. Here, we review some recent attempts to extend the approach to engineer nonlocal and non-Hermitian effects in metamaterials.
14:30 - 15:00 - Linear elastodynamic cloaking : A review of transformational routes Extended oral [Show abstract]
  • Sebastien Guenneau, Institut Fresnel, CNRS, Aix-Marseille Université, France
  • Andre Nicolet, Institut Fresnel, CNRS, Aix-Marseille Université, France
  • Frederic Zolla, Institut Fresnel, CNRS, Aix-Marseille Université, France
  • Andre Diatta, Institut Fresnel, CNRS, Aix-Marseille Université, France
  • Martin Wegener, Karlsruhe Institute of Technology (KIT, Germany
  • Muamer Kadic, Institut FEMTO-ST, CNRS, Université de Bourgogne Franche-Comté, France
We review miscellaneous transformational proposals for elastodynamic cloaks. The seminal of work of [Milton et al., NJP 8, 248, 2006], on form invariance of the linear elasticity equations has opened new vistas in the control of mechanical vibrations in solids thanks to Willis’s equations that retain their form under geometric transform. In their tracks, other proposals have been made, including cloaking via Cosserat media [Brun et al., APL 94, 061903, 2009], wherein the transformed elasticity tensor looses its minor symmetries. It has been also numerically and experimentally demonstrated that a direct lattice approach with an adiabatic transform [Bückmann et al., PNAS 112, 4930, 2015] allows for nearly perfect cloaking in the static case. The latter approach leads to good cloaking efficiency in the dynamic regime. These works pave the way towards control of mechanical vibrations ranging from ultrasonics to geophysics.
15:00 - 15:15 - Detecting the Chirp Signals on the Surface of the Transformation Materials GRIN Lens Oral [Show abstract]
  • Jiang-chao Shi , School of Information and Electronics, Beijing Institute of Technology, China
  • Jin Hu, School of Information and Electronics, Beijing Institute of Technology, China
Part of the optical axis inside a conventional graded index lens is exposed to the surface with the help of transformation optics, with which the chirpiness detection can be more convenient, efficient and precise based on the optical fractional Fourier transform.
15:15 - 15:30 - Waveguide tapering using Conformal transformation optics for ideal transmission Oral [Show abstract]
  • Hossein Eskandari, Department of Electrical Engineering, Ferdowsi university of Mashhad, Iran
  • Amir Reza Attari, Department of Electrical Engineering, Ferdowsi university of Mashhad, Iran
  • Mohammad Saeed Majedi, Department of Electrical Engineering, Ferdowsi university of Mashhad, Iran
  • Tomas Tyc, Department of Theoretical Physics and Astrophysics, Masaryk University, Czech Republic
<p> In this paper, conformal transformation optics (TO) is employed to guide the electromagnetic wave between two waveguides with different cross-sections. Owing to the properties of conformal mapping, an all-dielectric medium is obtained. The conformal transformation is derived by solving the Laplace equation. The tapering equation is obtained by conducting an optimization to achieve maximum less-than-unity refractive index while maintaining the uniformity of the refractive index at the input and output boundaries. The functionality of the proposed idea is confirmed by a simulation in COMSOL.</p>
15:30 - 16:00 - Coffee break (Monday afternoon)
16:00 - 18:00 - Oral sessions (Monday - afternoon 2)
16:00 - Special session on topological band gaps in metamaterials (part 2)
16:00 - 16:30 - Do Truly Unidirectional and Topological Surface Plasmon-Polaritons Exist? Invited oral [Show abstract]
  • Francesco Monticone, Cornell University, USA
In this talk, we discuss all the available physical mechanisms that may endow a homogenous plasmonic platform with directionality, the impact of nonlocality and dissipation on unidirectional surface plasmon-polaritons, and some apparent paradoxes. Our work sheds new light on the propagation properties of surface waves on nonreciprocal plasmonic materials.
16:30 - 17:00 - Experimental Observation Of High-order Topological Corner States In 2D Photonic Kagome Lattice Extended oral [Show abstract]
  • Dmitry Zhirihin, ITMO University, Russia
  • Mengyao Li, The City University of New York, USA
  • Dmitry Filonov, ITMO University, Russia
  • Xiang Ni, The City University of New York, USA
  • Alexey Slobozhanyuk, ITMO University, Russia
  • Andrea Alu, The City University of New York, USA
  • Alexander Khanikaev, The City University of New York, USA
In this paper we experimentally realize high-order photonic topological insulator as a two-dimensional triangular distorted Kagome lattice that supports two types of topological states: 1D topological edge states and 0D high-order topological states localized at the corners. Using near-field scanning technique we demonstrate both topological edge states and topological corner state in microwave frequency spectrum.
17:00 - 17:15 - Photonic Topological Insulator Edge Modes Using All-Dielectric Kagome Photonic Crystals Oral [Show abstract]
  • Stephan Wong, Cardiff University, United Kingdom
  • Matthias Saba, Imperial College London, United Kingdom
  • Ortwin Hess, Imperial College London, United Kingdom
  • Sang Soon Oh, Cardiff University, United Kingdom
<p> We propose an all-dielectric reciprocal kagome-like photonic topological insulator in which the topological edge modes do not undergo back-reflection for termination along the $Gamma {-} K$ direction. In contrast to the perturbed honeycomb, the edge modes in our kagome-based structure are below the light cone leading to improved vertical mode confinement.</p>
17:15 - 17:45 - Symmetry-Protected Edge Modes in Metasurface Junctions Extended oral [Show abstract]
  • Enrica Martini, University of Siena, Italy
  • Mario Silveirinha, University of Lisbon, Portugal
  • Valentina Verri, Huawei Technologies Italia, Italy
  • Fabio Morgia, Huawei Technologies Italia, Italy
  • Claudio Massagrande, Huawei Technologies Italia, Italy
  • Maurizio Mattivi, Huawei Technologies Italia, Italy
  • Stefano Maci, University of Siena, Italy
This contribution presents a metasurface-based guiding structure supporting an edge mode which is symmetry-protected against backscattering. It consists of the combination of two couples of semi-infinite planar surfaces with complementary impedances, arranged to form a parallel plate waveguide with mirror reflection symmetry. The particular case of PEC/PMC boundary conditions is analytically characterized and the theory is numerically validated through full-wave simulations
17:45 - 18:00 - Bounds on Hotspots in Unidirectional Waveguides and Photonic Topological Insulators for Strong, Broadband Light-Matter Interaction Oral [Show abstract]
  • Sander Mann, CUNY ASRC, USA
  • Ahmed Mekkawy, CUNY ASRC, USA
  • Andrea Alù, CUNY ASRC, USA
We investigate fundamental bounds on the field strength in nonreciprocal hotspots in both magnetically biased plasmonic waveguides and topological photonic insulators. We prove that in topological photonic insulators an output channel is always present, and demonstrate broadband and strongly enhanced second harmonic generation in a magnetically biased plasmonic waveguide.
16:00 - Acoustical and mechanical metamaterials (part 1)

Session chairperson(s): Konstantin Tretiakov

16:00 - 16:15 - A gyro-elastic device for cloaking of elastic waves in micro-structured materials Oral [Show abstract]
  • Michael Nieves, Keele University/University of Cagliari, United Kingdom/Italy
  • Marta Garau, Keele University, United Kingdom
  • Giorgio Carta, Liverpool John Moores University, United Kingdom
  • Michele Brun, University of Cagliari, Italy
The design of a structured gyro-elastic system capable of being used as a cloaking device for a discrete medium is discussed. The efficiency of the gyro-elastic cloak, composed of springs connecting periodically placed masses, attached to gyroscopic spinners, is examined in the transient regime. An important effect encountered shows that the speed of the reconstructed field can be altered by tuning the gyroscopes.
16:15 - 16:30 - Tailoring the Size Scaling Of Periodic And Non-periodic Three-dimensional Chiral Microstructures Oral [Show abstract]
  • Patrick Ziemke, Karlsruhe Institute of Technology, Germany
  • Tobias Frenzel, Karlsruhe Institute of Technology, Germany
  • Martin Wegener, Karlsruhe Institute of Technology, Germany
  • Peter Gumbsch, Karlsruhe Institute of Technology, Germany
The twist-to-strain coupling of chiral mechanical metamaterials scales asymptotically inversely proportional to the sample side length. Here, we present a threedimensional chiral crystal lattice built from two types of unit cells, which allows tailoring the onset of this asymptotic scaling over an order of magnitude. Furthermore, we present an architecture which does not show any decay of the twist.
16:30 - 17:00 - Coherent control of mechanical states in surface-coupled phononic resonators Invited oral [Show abstract]
  • Sarah Benchabane, FEMTO-ST, CNRS, Université de Bourgogne Franche-Comté, France
  • Laetitia Raguin, FEMTO-ST, CNRS, Université de Bourgogne Franche-Comté, France
  • Olivier Gaiffe, FEMTO-ST, CNRS, Université de Bourgogne Franche-Comté, France
  • Roland Salut, FEMTO-ST, CNRS, Université de Bourgogne Franche-Comté, France
  • Valérie Soumann, FEMTO-ST, CNRS, Université de Bourgogne Franche-Comté, France
  • Jean-Marc Cote, FEMTO-ST, CNRS, Université de Bourgogne Franche-Comté, France
  • Vincent Laude, FEMTO-ST, CNRS, Université de Bourgogne Franche-Comté, France
  • Abdelkrim Khelif, FEMTO-ST, CNRS, Université de Bourgogne Franche-Comté, France
We demonstrate that interaction between mechanical resonators and surface acoustic waves (SAW) can be used to manipulate mechanical vibrations in deep sub-wavelength features. By retrieving the frequency dependence and the vectorial nature of the mechanical motion, a variety of coupling schemes are observed, opening prospects for local coherent control of mechanical vibration and SAW propagation.
17:00 - 17:30 - Guiding Stress with Discrete Networks Extended oral [Show abstract]
  • Graeme Milton, University of Utah, Department of Mathematics, USA
  • Guy Bouchitte, Institut de Mathematiques de Toulon, Universite de Toulon, France
  • Ornella Mattei, University of Utah, Department of Mathematics, USA
  • Pierre Seppecher, Institut de Mathematiques de Toulon, Universite de Toulon, France
Pentamode materials are a class of materials that are useful for guiding stress. In particular, they have been proposed for acoustic cloaking by guiding stress around objects A key feature of pentamode materials is that each vertex in the material is the junction of 4 double cone elements. Thus the tension in one element determines the tension in the other elements, and by extension uniquely determines the stress in the entire metamaterial. Here we show how this key feature can be extended to discrete wire networks, supporting forces at the terminal nodes and which may have internal nodes where no forces are applied. In usual wire or cable networks, such as in a bridge or bicycle wheel, one distributes the forces by adjusting the tension in the wires. Here our discrete networks provide an alternative way of distributing the forces through the geometry of the network. In particular the network can be chosen so it is uniloadable, i.e. supports only one set of forces at the terminal nodes. Such uniloadable networks provide the natural generalization of pentamode materials to discrete networks.
17:30 - 18:00 - Towards Vibrational Waves Via High-order Topological Invariants in Mechanical Structures Invited oral [Show abstract]
  • Zeb Rocklin, Georgia Institute of Technology, USA
The geometry of mechanical elements can induce high-order topological invariants in metamaterials. These invariants, which rely on the number of mechanical constraints, generate and protect modes of deformation localized to corners of the system.
16:00 - Non-linear, tunable and reconfigurable metamaterials (part 1)

Session chairperson(s): Sergei Tretyakov

16:00 - 16:15 - Optical bistability theory of film-coupled metasurfaces No show [Show abstract]
  • Patrick Bowen, Duke University, USA
  • Zhiqin Huang, Duke University, USA
  • David Smith, Duke University, USA
We present an analytic treatment of bistability in metasurfaces of optical nanopatch antenna arrays that are coupled to a metal film using quasinormal modes. Collective surface effects are included through the surface plasmon mediated interaction constant, which predicts bistable surface modes in addition to bistability within the nanopatch resonance.
16:15 - 16:30 - Optical Metamaterial Reconfigured with Sound Oral [Show abstract]
  • Dimitrios Papas, University of Southampton, United Kingdom
  • Jun-Yu Ou, University of Southampton, United Kingdom
  • Eric Plum, University of Southampton, United Kingdom
  • Nikolay I. Zheludev, University of Southampton and Nanyang Technological University, United Kingdom and Singapore
<p> We demonstrate that ultrasound vibrations cause linear and nonlinear changes of optical properties of nanomechanical metamaterials. We observe up to 73% linear acousto-optical reflectivity modulation in a metamaterial of only 100 nm thickness and substantial nonlinear acousto-optical modulation up to the sixth order.</p>
16:30 - 16:45 - Broadband Helicity Switching for Terahertz Waves Using Anisotropically Deformed Checkerboard Metasurface with Vanadium Dioxide Oral [Show abstract]
  • Toshihiro Nakanishi, Kyoto University, Japan
  • Yosuke Nakata, The University of Tokyo, Japan
  • Yoshiro Urade, RIKEN, Japan
  • Kunio Okimura, Tokai University, Japan
We propose an anisotropic metasurface that works as a reconfigurable quarter wave plate for terahertz waves. The helicity of circularly polarized waves can be switched owing to vanadium dioxide introduced at the corners of deformed checkerboard patterns. The fabricated metasurface has realized helicity switching in a broad spectral range.
16:45 - 17:00 - Optical Second Harmonic Generation in Amorphous Silicon Metamaterial Oral [Show abstract]
  • Jie Xu, University of Southampton, United Kingdom
  • Vassili Savinov, University of Southampton, United Kingdom
  • Eric Plum, University of Southampton, United Kingdom
  • Nikolay I. Zheludev, University of Southampton and Nanyang Technological University, United Kingdom and Singapore
<p> Second harmonic generation in centrosymmetric media is forbidden. However, symmetry breaking by mesoscopic structuring can introduce substantial second-order nonlinear polarizability. We report efficient optical second harmonic generation in 90nm-thick amorphous silicon metamaterial. A chevron nanopattern removes the inversion center, introducing effective second-order polarizability enhanced by a closed-mode resonance.</p>
17:00 - 17:30 - Second harmonic generation from resonant dielectric and metal-dielectric nanoantenna Invited oral [Show abstract]
  • Mihail Petrov, ITMO University , Russia
The generation of second harmonic from nanophotonic structures has been reconsidered recently with the emergence of subwavelength resonant non-plasmonic systems. The wide range of dielectric and semiconductor materials without central symmetry offer new opportunities to achieve high efficiency from subwavelength sources. In this work, we present a basic theoretical description of second harmonic generation from nanoparticles with bulk nonlinearity. We also show how one can enhance efficiency and manipulate the nonlinear emission with hybrid metal-dielectric nanodimers.
17:30 - 17:45 - Second harmonic generation driven by magnetic dipole moment in dielectric nanoparticles of different shapes. Oral [Show abstract]
  • Kristina Frizyuk, ITMO University, Russia
  • Mihail Petrov, ITMO University, Russia
In this work we suggest a technique helping to identify the selection rules in second harmonic generation from dielectric nanoparticles pumped at their magnetic dipole resonance. We present the identified mode content of the second harmonic field for nanostructures of cylindrical, cone, and prism shapes made of a material with Td and C4v symmetries. This method is applicable for finding the selection rules for arbitrary particle shapes and crystalline structures and can be expanded to other nonlinear processes.
17:45 - 18:00 - Active Polarized Tuning of Near-field in Hybrid Metal/Dielectric Nanostructures Upon Femtosecond Laser Reshaping Oral [Show abstract]
  • Yali Sun, ITMO University, Russia
  • Dmitry Zuev, ITMO University, Russia
Femtosecond laser reshaping has been proposed to tune the near-field of hybrid oligomers. Strong field enhancement has been observed by scanning near-field optical microscope after modification. A moderate and comparable shift of far-field has been verified by a confocal dark-field measurement of modified oligomers under different polarizations of laser radiation.
16:00 - RF and microwave metamaterials (part 2)

Session chairperson(s): Silvio Hrabar

16:00 - 16:30 - Toward Learning Optimal Task-Specific Illumination Patterns: Application to Object Classification with a Dynamic Metasurface Aperture Extended oral [Show abstract]
  • Philipp del Hougne, Institut de Physique de Nice, France
  • Aaron V. Diebold, Duke University, USA
  • Mohammadreza F. Imani, Duke University, USA
  • Roarke Horstmeyer, Duke University, USA
  • David R. Smith, Duke University, USA
We propose a scheme for object classification that jointly optimizes the illumination of the scene with a dynamic metasurface aperture (DMA) and the weights of the corresponding post-processing artificial neural network. Approximating the DMA’s metamaterial elements as magnetic dipoles, we include the physical layer (propagation from each metamaterial element to the scene) in the classification pipeline. Our results demonstrate that tailoring the illumination to the specific classification task at hand highlights important features and considerably reduces the number of required distinct illuminations.
16:30 - 16:45 - Left-handed metamaterials matched to free space through mechanical tuning Oral [Show abstract]
  • Juan D. Baena, Universidad Nacional de Colombia, Colombia
  • Ana C. Escobar, Universidad Nacional de Colombia, Colombia
  • Andrey Sayanskiy, ITMO, Russia
  • Stanislav B. Glybovski, ITMO, Russia
We have proposed a unit cell with a hybridized electric-magnetic resonant mode. The electric and magnetic polarizabilities approximately match one each other in a certain frequency range around the resonance, so that the effective wave impedance matches the one of the free space. The left-handed behavior was demonstrated between 3.38 GHz and 3.59 GHz where the transmission coefficient approximately reaches 1 with negligible ripples. This fact can be interpreted as a very good impedance matching with the free space.
16:45 - 17:00 - Quasi-Optical Excitation of Modulated Metasurface Antennas Oral [Show abstract]
  • Jorge Ruiz García, Univ. Rennes, France
  • David González Ovejero, Univ. Rennes, France
  • Marco Faenzi, Univ. Rennes, France
  • Adham Mahmoud, Univ. Rennes, France
  • Mauro Ettorre, Univ. Rennes, France
  • Patrick Potier, Direction Générale de l'Armement, France
  • Philippe Pouliguen, Direction Générale de l'Armement, France
  • Ronan Sauleau, Univ. Rennes, France
<p> We present a new architecture for modulated metasurface (MTS) antennas with rectangular shape and fed by means of a pillbox-type quasi-optical beamformer. Two design examples are realized, the first one consists of a linearly-polarized antenna with amplitude tapering to increase the aperture efficiency, while the second one provides a circularly-polarized pencil beam. We show that the proposed structure is able to provide high aperture efficiencies similar to those already demonstrated with circular apertures. Moreover, the use of multiple sources in the focal plane allows us to introduce multi-beam capabilities.</p>
17:00 - 17:15 - Metamaterials for Wireless Power Transfer Oral [Show abstract]
  • Christopher Stevens, Oxford University, United Kingdom
Abstract – Wireless power transfer systems using metasurfaces as energy transfer media have been developed. Previous implementations have injected power fro one end of a one dimensional structure and carried it to a load located somewhere over that line. In this work we are looking at power transfer for energy injection at the midpoint of a 1D line as a starting point to begin describing fully two dimensional systems.
17:15 - 17:30 - Metasurface for Extension of Wireless Power Transfer Distance Oral [Show abstract]
  • MINGZHAO SONG, ITMO University, Russia
  • Pavel Belov, ITMO University, Russia
  • S. Glybovski, ITMO University, Russia
  • Constantin Simovski, Department of Electronics and Nanoengineering, Aalto University, Finland
  • Polina Kapitanova, ITMO University, Russia
<p> We report on a design of metasurface formed by parallel conducting wires for wireless power transfer system. The metasurface being exited by a dielectric resonator guides the power to the receiving resonator. We both numerically and experimentally demonstrate that a stable power transfer efficiency of 83% can be achieved over the distance up to 100 cm between the transmitting and receiving resonators.</p>
17:30 - 17:45 - Metasurface-bounded open cavities supporting virtual absorption: free-space energy accumulation in lossless systems Oral [Show abstract]
  • Angelica Viola Marini, Università degli Studi Roma Tre, Italy
  • Davide Ramaccia, Università degli Studi Roma Tre, Italy
The opportunities offered by energy absorbing, storing, and releasing in lossless systems are here exploited by exciting the zero-scattering condition of a metasurface-bounded open cavity. We investigate on the so-called virtual absorption condition supported by a partially open cavity, bounded by an infinite reflector and a metasurface. Starting from the theoretical analysis, we analytically find that the system exhibits a set of zeros of the scattering eigenvalues in the complex frequency plane, which correspond to the anomalous response of virtual absorption. The feasibility of the structure and its easy physical insights offered by the complex frequency analysis may enable the design of lossless systems with dynamic properties in energy.
17:45 - 18:00 - Orbital Angular Momentum Mode Purity Study of 3D-printed Spiral Phase Plates Oral [Show abstract]
  • Dmitry Isakov, WMG, University of Warwick, United Kingdom
  • Yingwei Wu, University of Oxford, United Kingdom
  • Ben Allen, University of Oxford, United Kingdom
  • Patrick Grant, University of Oxford, United Kingdom
  • Chris Stevens, University of Oxford, United Kingdom
  • Greg Gibbons, University of Warwick, United Kingdom
Taking advantage of computer-aided design software, additive manufacturing or 3D printing provides great flexibility in the fabrication of new devices. In this work, we benefit from 3D printing in the exploitation of the dielectric Spiral Phase Plate (SPP) generating an electromagnetic wave with helical wavefront. Three types of SPPs, with mode number l = |1| have been 3D-printed using Material Extrusion and Multi-Jetting technologies. The phase mode analysis and mode characteristics of the generated helical radio waves as a function of SPP geometrical features have been investigated through simulation and experimentally in the 12–18 GHz frequency range.
18:00 - 20:00 - Special Event and Welcome Reception
18:00 - Special Event
18:00 - 18:30 - In Memory of Prof. Victor Veselago [Show abstract]
  • Konstantin Simovski, Aalto University, FInland
  • Sergey Bozhevolnyi, University of Southern Denmark, Denmark
  • Alexandra Boltasseva, Purdue University, USA
Some memories in honor of Prof. Victor Veselago
17 September 2019 / Start time: 9 h 0 min
09:00 - 10:00 - Plenary session II
09:00 - Plenary session II

Session chairperson(s): Martin Wegener

09:00 - 10:00 - Tunable, On-chip Phononic Devices Operating at MHz Frequencies Plenary [Show abstract]
  • Chiara Daraio, California Institute of Technology, USA
Nanoelectromechanical systems (NEMS) that operate in the megahertz (MHz) regime allow energy transducibility between different physical domains. For example, they convert optical or electrical signals into mechanical motions and vice versa. This coupling of different physical quantities leads to frequency-tunable NEMS resonators via electromechanical non-linearities. In this talk, I will describe one- and two-dimensional, non-linear, nanoelectromechanical lattices (NEML) with active control of the frequency band dispersion in the radio-frequency domain (10–30 MHz). Our NEMLs consist of a periodic arrangement of mechanically coupled, free-standing nanomembranes with circular clamped boundaries. This design forms a flexural phononic crystal with a wide and well-defined bandgap. The application of a d.c. gate voltage creates voltage-dependent on-site potentials, which can significantly shift the frequency bands of the device. Additionally, I will discuss the experimental realization of topological nanoelectromechanical metamaterials with protected edge states. These on-chip integrated acoustic components could be used in unidirectional waveguides and compact delay lines for high-frequency signal-processing applications.
10:00 - 10:30 - Coffee break (Tuesday morning)
10:30 - 12:30 - Oral sessions (Tuesday morning)
10:30 - Special session on time-varying metamaterials (part 1)

Session chairperson(s): Hossein Mosallaei

10:30 - 11:00 - Time-Varying Nanoantenna Metamaterials Invited oral [Show abstract]
  • Mohammad Mahdi Salary, Northeastern University, USA
  • Hossein Mosallaei, Northeastern University, USA
We review our progress on the area of time-varying metamaterials. We present several methodologies for realization of time-modulated metasurfaces at optical frequencies through integration of electro-optical materials into the constituent nanoantennas. Novel design principles are established for extending the degree of light manipulation in the four-dimensional design space provided by time-varying metamaterials.
11:00 - 11:30 - Space-time Modulated Elastic Metamaterials and Their Applications in Floquet Topological Insulators Extended oral [Show abstract]
  • Guoliang Huang, University of Missouri, USA
  • Yangyang Chen, University of Missouri, United States
  • Hui Chen, University of Missouri, United States
  • Hussein Nassar, University of Missouri, United States
Breaking reciprocity with spatiotemporal modulation provides an opportunity to design unprecedented optical, acoustic and mechanical waveguides. Here, we design a tunable space-time modulated elastic metamaterial and experimentally demonstrate non-reciprocal flexural wave propagation. A Floquet topological insulator based on the time modulated metamaterial is finally designed and topologically protected one-way edge states are numerically tested.
11:30 - 12:00 - Comprehensive Description of Spacetime Crystal Bandgaps Extended oral [Show abstract]
  • Zoe-Lise Deck-Leger, Polytechnique Montreal, Canada
  • Christophe Caloz, Polytechnique Montreal, Canada
The dispersion diagram is a graphical representation of wave scattering that summarizes the most fundamental properties of crystals: it includes all the information on the frequency dependence of the phase and group velocities and on the attenuation of the medium. Here, we provide exact formulas for the positions of spacetime-crystal bandgaps taking into account the asymmetry of the uncoupled harmonics, and unveil the complex nature of the frequencies in these bandgaps, in addition to the usual complex wavenumbers.
12:00 - 12:15 - Frequency-shifted reflection achieved through time-varying metasurfaces Oral [Show abstract]
  • Davide Ramaccia, "RomaTre" university , Italy
  • Dimitrios Sounas, Wayne State University, U.S.A.
  • Andrea Alù, Photonic Initiative, CUNY ASRC, U.S.A.
  • Alessandro Toscano, "RomaTre" university, Italy
  • Filiberto Bilotti, "RomaTre" university, Italy
In this contribution, we present a time-modulated full-reflective metasurface able to realize a frequency shift of a normally impinging electromagnetic plane wave. The frequency conversion is achieved by a dynamic control of the reflection phase, which emulates the phase advance (phase delay) of the field when reflected by a scatterer moving towards (away from) the source. The metasurface consists of three layers: the first two layers are used for realizing an array of mirrored mushrooms, i.e. two metallic patches printed on the two sides of a dielectric substrate and connected by a via; the third layer is a metallic ground plane that enforces the zero transmission. The patches are loaded by a set of varactors controlled by a low-frequency time-varying voltage signal. The metasurface and biasing network are properly designed for ensuring the operation for both polarization of the illuminating plane wave. We report here our results, showing the ability of the metasurface to reflect a frequency-shifted signal according to the modulation imparted by the varactors. The proposed metasurface can be used for realizing electrically thin Doppler cloak, which can restore the source illumination frequency of a moving object, as if it were not in motion.
12:15 - 12:30 - Mixer-Antenna Medium Oral [Show abstract]
  • Sajjad Taravati, University of Toronto, Canada
  • George V. Eleftheriades, University of Toronto, Canada
We introduce a medium that functions simultaneously as a mixer and an antenna. Such a functionality is achieved by leveraging the unique properties of an obliquely illuminated space-time-modulated medium, supporting both propagating and surface waves. We first present the operation principle of surface-wave generation in a space-time-modulated medium and then elaborate on the incoming propagating wave being transformed into a surface wave. The theoretical analysis of the structure is supported by numerical simulation results.
10:30 - Special session on metamaterials and electromagnetic heat transport (part 2)

Session chairperson(s): Harry Atwater

10:30 - 11:00 - Refractory Metasurfaces for Solar Thermophotovoltaics Invited oral [Show abstract]
  • Hou-Tong Chen, Los Alamos National Laboratory, USA
  • Chun-Chieh Chang, Los Alamos National Laboratory, USA
  • Wilton Kort-Kamp, Los Alamos National Laboratory, USA
  • John Nogan, Sandia National Laboratories, USA
  • Ting Luk, Sandia National Laboratories, USA
  • Abul Azad, Los Alamos National Laboratory, USA
  • Antoinette Taylor, Los Alamos National Laboratory, USA
  • Milan Sykora, Los Alamos National Laboratory, USA
  • Diego Dalvit, Los Alamos National Laboratory, USA
We demonstrate tungsten-based refractory metasurfaces for solar thermophotovoltaics (STPV) with tailored absorptance and emittance characterized by in situ high-Temperature measurements, featuring thermal stability up to at least 1200 C. These metasurface structures can be fully integrated as the intermediate structure, opening a path forward for high-performance STPV systems.
11:00 - 11:30 - Machine-Learning-Assisted Topology Optimization For Highly Efficient Thermal Emitter Invited oral [Show abstract]
  • Alexandra Boltasseva, Purdue University, USA
  • Zhaxylyk Kudyshev, Purdue University, USA
  • Simeon Bogdanov, Purdue University, USA
  • Alexander Kildishev, Purdue University, USA
  • Vladimir Shalaev, Purdue University, USA
We coupled generative adversarial network with topology optimization for efficient thermal emitter design development. The proposed method can generate highly efficient metasurface designs with a non-trivial topology for efficient spectral control of thermal blackbody. Additionally we have shown that supervised learning algorithms can boost up identification of single-photon emitters through second-order autocorrelation function analysis as well as can be applied to single-shot spin readout process
11:30 - 12:00 - A Metamaterial Approach to Radiative Heat Transfer Invited oral [Show abstract]
  • Juan Carlos Cuevas, Universidad Autonoma de Madrid, Spain
  • Víctor Fernández-Hurtado, Universidad Autonoma de Madrid, Spain
  • Edwin Moncada-Villa, Universidad Pedagógica y Tecnológica de Colombia, Colombia
  • Antonio I. Fernández-Domínguez, Universidad Autonoma de Madrid, Spain
  • Johannes Feist, Universidad Autonoma de Madrid, Spain
  • Juan José García-Esteban, Universidad Autonoma de Madrid, Spain
  • Sanhui Fan, Stanford University, USA
  • Francisco J. García-Vidal, Universidad Autonoma de Madrid, Spain
In this talk I will review our theoretical efforts in recent years to understand how the use of metamaterials can help us to defy Planck’s law and to establish new paradigms in the field of thermal radiation.
12:00 - 12:30 - Mid-IR Emission at High Modulation Rates with Incandescent Metasurfaces Invited oral [Show abstract]
  • Jean-Jacques Greffet, Institut d'Optique, France
  • Léo Wojszvzyk, Institut d'Optique, France
  • Anne-Lise Coutrot, Institut d'Optique, France
  • Mondher Besbes, Institut d'Optique, France
  • Jean-Paul Hugonin, Institut d'Optique, France
  • Benjamin Vest, Institut d'Optique, France
We report a numerical and experimental study of a metasurface patterned with arrays of nanowires, that reaches an emissivity close to 1 at 4.5 microns and can be operated at modulation rates up to 20 MHz.
10:30 - Optical metamaterials (part 1)

Session chairperson(s): Francesco De Angelis

10:30 - 10:45 - Helmholtz-like Nanoresonators Applied to Surface Enhanced Infrared Absorption Oral [Show abstract]
  • Alice Fabas, ONERA, Université Paris Saclay, France
  • Hasnaa El Ouazzani, ONERA, Université Paris Saclay, France
  • Jean Paul Hugonin, Laboratoire Charles Fabry, Université Paris Saclay, France
  • Riad Haïdar, ONERA, Université Paris Saclay, France
  • Jean Jacques Greffet, Laboratoire Charles Fabry, Université Paris Saclay, France
  • Patrick Bouchon, ONERA, Université Paris Saclay, France
Nanostructures exhibiting high electric field enhancement are very appealing for infrared spectroscopic applications. The optical Helmholtz resonator presents very high enhancement factors within hot volumes. Nevertheless, its nanofabrication is rather challenging and has hindered its practical use. Here, we introduce and study, both theoretically and experimentally, a simplified nanostructure that supports an Helmholtz-like resonance with the expected high electric field enhancement. This resonator is then applied to the SEIRA detection of 2,4-dinitrotoluene, leading to reflectivity changes up to 15%.
10:45 - 11:00 - Extraordinary transparent metasurfaces composed of transverse scatterers Oral [Show abstract]
  • Hadi Shamkhi, ITMO University, Russia
  • Kseniia Baryshnikova, ITMO University, Russia
  • Andrey Sayanskiy, ITMO University, Russia
  • Polina Kapitanova, ITMO University, Russia
  • Pavel Terekhov, Ben-Gurion University of the Negev, Isreal
  • Pavel Belov, ITMO University, Russia
  • Alina Karabchevsky, Ben-Gurion University of the Negev, Isreal
  • Andrey Evlyukhin, University of Southern Denmark, Denmark
  • Yuri Kivshar, Australian National University, Australia
  • Alexander Shalin, ITMO University, Russia
We present a novel optical effect where the scattered light on dielectric particles is suppressed simultaneously in the forward and backward directions. The metasurface constructed from such transverse scatterers is extraordinary transparent for the incident light where neither the phase nor the amplitude is perturbed.
Media link(s):

See arxiv preprint

11:00 - 11:15 - Dual-Metasurface Superlens: Full Wave Verification of Scatterers Imaging for Practical Applications Oral [Show abstract]
  • Masoud Sharifian Mazraeh Mollaei, Aalto University, Finland
  • Constantin Simovski, Aalto University, Finland
A dual-metasurface superlens comprising two planar arrays of silver nanospheres dedicated to the near-field optical imaging of submicron objects is presented. Compared to previous works where we have analyzed this technique, we show the possibility of nano-imaging not for radiating sources but for scattering objects illuminated by a plane wave and refuse of the idea to suppress the horizontal polarization of nanospheres. Using both approximate semi-analytical model and full-wave simulations, we optimize the parameters of the structure and achieve the spatial resolution λ/6 at the distances slightly larger than λ/2.
11:15 - 11:30 - All-dielectric Metalens Array for Polarimetric Beam Profiling Oral [Show abstract]
  • Zhenyu Yang, Huazhong University of Science and Technology, China
  • Ming Zhao, Huazhong University of Science and Technology, China
  • Xiuhua Yuan, Huazhong University of Science and Technology, China
Here, we show a design and fabrication of all-dielectric metalens array to achieve the state of polarization and the phase gradient detection operating at 1550 nm in transmission mode. Furthermore, we demonstrate an oblique incident radially polarized beam profilling. Each metalens (numerical aperture of 0.32) has an average focusing efficiency of about 45% at 1550 nm.
11:30 - 12:00 - How Thin Multilayer Hyperbolic Metamaterial Can Be? Invited oral [Show abstract]
  • Andrei Lavrinenko, Technical University of Denmark, Denmark
  • Johneph Sukham, Technical University of Denmark, Denmark
  • Maryam Mahmoodi, Shahid Beheshti University, Iran
  • Stanislav Sychev, Saint Petersburg National Research University of Information Technologies , Mechanics and Optics, Russia
  • Andrey Bogdanov, Saint Petersburg National Research University of Information Technologies , Mechanics and Optics, Russia
  • Seyed Hassan Tavassoli, Shahid Beheshti University, Iran
  • Radu Malureanu, Technical University of Denmark, Denmark
We fabricated a series of stacks with up to 10 periods of 10 nm gold – 10 nm alumina layers of exceptional quality keeping the roughness root mean square well below 1 nm. Characterization supported by modeling shows that starting from four periods, the multilayers properties are reasonably good expressed through effective medium approximation.
12:00 - 12:30 - Photoacoustic Spectroscopy for Resonant Phenomena Invited oral [Show abstract]
  • Concita Sibilia, Università di Roma La Sapienza, Italy
<p> Here we report on the resonant absorption properties in GaAs-based nanowires (NWs), characterized by photo-acoustic spectroscopy (PAS) measurements. NWs were fabricated by self-catalyzed, lithography-free growth on Si substrates and with highly controllable dimensions. Their diameters (~150 nm) and lengths (~5 µm) allow for the excitation of resonant absorption modes in the visible and near-IR parts of the spectrum, which results in the absorption peaks measured by PAS. Both spectral position and peak amplitudes are in great agreement with numerical predictions. Moreover, we use PAS in similar samples partially covered by Au, and we prove circular dichroic behavior at oblique incidence. The results show that this low-cost, stable, and scattering-free technique can be used to characterize, investigate and optimize the design vertical semiconductor NWs for various photonic applications.</p>
10:30 - Antenna and absorber applications of metamaterials (part 2)

Session chairperson(s): Richard Ziolkowski

10:30 - 10:45 - Metamaterials for Classical and Quantum Data Processing in All-Optical Fiber Information Networks Oral [Show abstract]
  • Anton Vetlugin, Nanyang Technological University, Singapore
  • Angelos Xomalis, University of Southampton, United Kingdom
  • Salih Yanıkgonul, Nanyang Technological University, Singapore
  • Ruixiang Guo, Nanyang Technological University, Singapore
  • Giorgio Adamo, Nanyang Technological University, Singapore
  • Iosif Demirtzioglou, University of Southampton, United Kingdom
  • Yongmin Jung, University of Southampton, United Kingdom
  • Eric Plum, University of Southampton, United Kingdom
  • Cosimo Lacava, University of Southampton, United Kingdom
  • Periklis Petropoulos, University of Southampton, United Kingdom
  • David Richardson, University of Southampton, United Kingdom
  • Cesare Soci, Nanyang Technological University, Singapore
  • Nikolay Zheludev, University of Southampton, United Kingdom
<p> We report on the use of fiber-integrated plasmonic metamaterial absorbers in signal processing applications in coherent information networks. Quantum states filtering, perfect nonlinear absorption, all-optical gating and encrypted signal distribution are demonstrated.</p>
10:45 - 11:00 - Broad Terahertz Radial Perfectly Symmetric Gradient Honeycomb All-Dielectric Planar Luneburg Lens Oral [Show abstract]
  • Jin Chen, Beijing Institute of Technology, China
  • Mingji Chen, Beijing Institute of Technology, China
  • Daining Fang, Beijing Institute of Technology, China
We propose an all-dielectric broad terahertz planar Luneburg lens with radial gradient honeycomb structure. Exquisite microstructure in the form of radial symmetric honeycomb column within subwavelength dimension was put forward to satisfy the requirement of refractive index of Luneburg lens. The results of full-wave simulation demonstrate excellent performance of our designed lens. Far field radiation pattern of the present lens is highly directive, incident waves could be concentrated on the opposite side of the lens with high convergence, and its operating frequency spans from 0.06THz to 0.24THz. Our design has great potential to be applied in terahertz communication and imaging via the growing 3D printing technology
11:00 - 11:30 - Self-Adaptive Invisible Antenna Trough Waveform-Depended Mantle Cloak Extended oral [Show abstract]
  • Stefano Vellucci, ROMA TRE University, Italy
  • Alessio Monti, Niccolò Cusano University, Italy
  • Mirko Barbuto, Niccolò Cusano University, Italy
  • Alessandro Toscano, ROMA TRE University, Italy
  • Filiberto Bilotti, ROMA TRE University, Italy
The aim of this contribution is to describe an innovative wire antenna able to automatically hide or reveal its presence depending on the waveform of the received/transmitted signal. This unconventional behavior is achieved through the use of a cloaking metasurface (MTS) made of a meander-like unit cell loaded with a lumped-element circuit. Due to the engineered time-domain response of the lumped circuit, the antenna is able switching its behavior when interacts with either a pulsed signal (PW) or a continuous signal (CW). The proposed configuration paves the way to a new generation of self-adaptive cloaking devices for antenna applications.
11:30 - 11:45 - High-Performance 50μm Silicon-Based On-Chip Antenna with High Port-To-Port Isolation Implemented by Metamaterial and SIW Concepts for THz Integrated Systems Oral [Show abstract]
  • Mohammad Alibakhshikenari, University of Rome “Tor Vergata”, Italy
  • Bal S. Virdee, London Metropolitan University, United Kingdom
  • Chan H. See, Edinburgh Napier University, United Kingdom
  • Raed Abd-Alhameed, University of Bolton, United Kingdom
  • Ernesto Limiti, University of Rome “Tor Vergata”, Italy
<p> A novel 50μm Silicon-based on-chip antenna is presented that combines metamaterial (MTM) and substrate integrated waveguide (SIW) technologies for integration in THz circuits operating from 0.28 to 0.30 THz. The antenna structure comprises a square patch antenna implemented on a Silicon substrate with a ground-plane. Embedded diagonally in the patch are two T-shaped slots and the edges of the patch is short-circuited to the ground-plane with metal vias, which convert the structure into a substrate integrated waveguide. This structure reduces loss resulting from surface waves and Silicon dielectric substrate. The modes in the structure can be excited through two coaxial ports connected to the patch from the underside of the Silicon substrate. The proposed antenna structure is essentially transformed to exhibit metamaterial properties by realizing two T-shaped slots, which enlarges the effective aperture area of the miniature antenna and significantly enhances its impedance bandwidth and radiation characteristics between 0.28 THz to 0.3 THz. It has an average gain and efficiency of 4.5dBi and 65.32%, respectively. In addition, it is a self-isolated structure with high isolation of better than 30dB between the two ports. The on-chip antenna has dimensions of 800×800×60 μm3.</p>
11:45 - 12:00 - Reflectionless perfect absorber with low angular and polarization sensitivity Oral [Show abstract]
  • Juan P. del Risco, Universidad Nacional de Colombia, Colombia
  • Andrey Sayanskiy, ITMO, Russia
  • Julián D. Ortiz, Universidad San Buenaventura, Colombia
  • Stanislav B. Glybovski, ITMO, Russia
  • Juan D. Baena, Universidad Nacional de Colombia, Colombia
We numerically demonstrate a perfect metasurface absorber which reaches the closest to isotropic absorbance that can be theoretically obtained. We got total absorption at 3.18 GHz while negligible reflection for angles of incidence up to 55° or 60°. Theoretical formulas are provided for the absorbance and reflectance as function of the incident angle.
12:00 - 12:15 - High Q-factor coupled Fabry-Perot plasmonic nanoresonator Oral [Show abstract]
  • Baptiste FIX, ONERA, France
  • Julien Jaeck, ONERA, France
  • Patrick Bouchon, ONERA, France
  • Nathalie Bardou, Center for Nanoscience and Nanotechnology (C2N)-CNRS, France
  • Sébastien Héron, ONERA, France
  • Benjamin Vest, ONERA, France
  • Riad Haïdar, ONERA, France
Fabry-Perot resonances have been reported in nanoantennas to behave independently. Here, we evidence the interferences between FP nanoantennas, with a strong impact on the optical behavior: increased absorption and Q-factor. We demonstrate analytically the FP-cavity coupling. We experimentally illustrate this high-Q factor resonance in a ribbon-shaped coupled FP-nanostructure.
12:15 - 12:30 - Infrared Metamaterial Perfect Absorber Based on Vanadium Dioxide Disk Arrays No show [Show abstract]
  • Xinrui Lyu, RWTH Aachen University, Germany
  • Thomas Taubner, RWTH Aachen University, Germany
  • Yunzhen Cao, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Key Laboratory of Inorganic Coating Materials CAS, China
  • Lixin Song Song, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Key Laboratory of Inorganic Coating Materials CAS, China
Utilizing thermochromic vanadium dioxide (VO2) as metallic arrays in the design of metamaterial absorber, we proposed a dynamic infrared perfect absorber with the structure of VO2 disk arrays/HfO2/Ag multilayers. The absorber exhibits a temperature-dependent absorption property due to the metal-insulator phase transition (MIT) in VO2. The simulation results show the wavelength of the absorption peak linearly redshifts with the increase of diameter of the VO2 disk when VO2 is at its metallic state. The tuning of peak position can be up to 3.7 μm with the change of 1 μm in diameter.
12:30 - 14:00 - Lunch break (Tuesday)
14:00 - 15:30 - Oral sessions (Tuesday - afternoon 1)
14:00 - Optical metrology and imaging

Session chairperson(s): Andrea Alu

14:00 - 14:30 - Metalens Dispersion Engineering and Integrated Imaging Devices Invited oral [Show abstract]
  • Tao Li, Nanjing University, China
  • S.M. Wang, Nanjing University, China
  • R.J. Lin, National Taiwan University, Taiwan, China
  • B.B. Xu, Nanjing University, China
  • J. Chen, Nanjing University, China
  • C. Chen, Nanjing University, China
  • P.C. Wu, National Taiwan University, Taiwan, China
  • V.C. Su, National Taiwan University, Taiwan, China
  • S.N. Zhu, Nanjing University, China
  • D.P. Tsai, National Taiwan University, Taiwan, China
Recent progresses in metasurface have opened a door of new type of ultra-thin optical elements for versatile applications. In this paper, I would like to firstly introduce several progresses in our group and our collaborators to access achromatic metasurfaces and metalens. Afterwards, we successfully realized a metalens array for light-field image, and an ongoing work using metalens array that integrated directly onto an imaging camera will also be demonstrated. These approaches are expected to advance the current imaging technology to a more compact, integrated, and stable level.
14:30 - 15:00 - Subwavelength Polarization Optics Using Helical Travelling-Wave Nanoantennas Invited oral [Show abstract]
  • Mengjia Wang, FEMTO-ST Institute, France
  • Roland Salut, FEMTO-ST Institute, France
  • Huihui Lu, Jinan University, China
  • Miguel Angel Suarez, FEMTO-ST Institute, France
  • Nicolas Martin, FEMTO-ST Institute, France
  • Thierry Grosjean, FEMTO-ST Institute, France
We present and demonstrate the concept of a helical travelling-wave nanoantenna (HTN) consisting of a tiny gold-coated helix end-fired with a rectangular aperture nanoantenna. Taken as individual or coupled nanostructures, HTNs lead to subwavelength polarization optics and provide new degrees of freedom in light polarization control.
15:00 - 15:15 - Overcoming the Diffraction Limit with High-index Dielectric Particles Oral [Show abstract]
  • Victor Pacheco-Peña, Newcastle University, United Kingdom
  • Miguel Beruete, Universidad Publica de Navarra, Spain
<p> We propose and demonstrate the ability to produce photonic nanojets using high refractive index dielectric particles. An extremely narrow focus is produced with a spatial resolution of ~0.06λ0. The imaging capabilities are studied by introducing metallic spheres within the focal region demonstrating that distances between objects as small as ~0.06λ0 can be distinguished.</p>
15:15 - 15:30 - The Resonant Behavior of a Single Plasmonic Helix Oral [Show abstract]
  • Katja Hoeflich, Helmholtz-Zentrum Berlin fuer Materialien und Energie, Germany
  • Thorsten Feichtner, University of Würzburg, Germany
  • Enno Hansjuergen, Carl von Ossietzky University Oldenburg, Germany
  • Caspar Haverkamp, Helmholtz-Zentrum Berlin fuer Materialien und Energie, Germany
  • Heiko Kollmann, Carl von Ossietzky University Oldenburg, Germany
  • Christoph Lienau, Carl von Ossietzky University Oldenburg, Germany
  • Martin Silies, Carl von Ossietzky University Oldenburg, Germany
<p> Single silver helices with strongly resonant features in the visible range are investigated. They show a strong circular dichroism with resonant features in good agreement with full field modeling. The mechanism of excitation is elucidated using a simple geometric model and analytical considerations.</p>
14:00 - Chiral and bianisotropic metamaterials

Session chairperson(s): Isabelle Staude

14:00 - 14:15 - Symmetries and Angular Scattering Properties of Metasurfaces Oral [Show abstract]
  • Karim Achouri, EPFL, Switzerland
We study the angular scattering behavior of bianisotropic metasurfaces and deduce relationships between the corresponding symmetrical angular scattering properties and the structural symmetries of their scattering particles. This may be of practical interest for the realization of metasurfaces with complex angular scattering characteristics.
14:15 - 14:30 - Combining Chirality and PT-symmetry in Metamaterials Oral [Show abstract]
  • Ioannis Katsantonis, Forth and University of Crete, Greece
  • Sotiris Droulias, Forth and University of Crete, Greece
  • Costas Soukoulis, Forth and Ames Laboratory, Iowa State, USA, USA
  • Eleftherios Economou, Forth and University of Crete, Greece
  • Maria Kafesaki, Forth and University of Crete, Greece
We investigate and present the conditions and the unique physical effects resulting from the combination of Parity-Time (PT-) symmetry with the fascinated properties offered by chiral metamaterials. Novel effects and polarization control possibilities, such as anisotropic transmission resonances for circularly polarized waves, are demonstrated and discussed.
14:30 - 14:45 - The interaction of strands in a double DNA-like helix at high-frequency resonance No show [Show abstract]
  • Ivan Mikhalka, Francisk Skorina Gomel State University, Belarus
  • Igor Semchenko, Francisk Skorina Gomel State University, Belarus
  • Sergei Khakhomov, Francisk Skorina Gomel State University, Belarus
  • Alexei Balmakou, Francisk Skorina Gomel State University, Belarus
A double DNA-like helix in which two strands are mutually displaced along a common axis is considered. A high-frequency resonance is investigated, at which the wavelength of the incident radiation is approximately equal to the length of a helix turn. All three components of the electric force and magnetic force acting on an arbitrary element of one strand from the side of the whole other strand are calculated. The dependence of all forces on the pitch angle of the double helix is investigated. The obtained results can be used when considering the equilibrium of a double helix, including as an element of metamaterials.
14:45 - 15:15 - Achiral and Helicity Preserving Cavity for Enhanced Infrared Sensing of Chiral Molecules Extended oral [Show abstract]
  • Joshua Feis, Karlsruhe Institute of Technology, Germany
  • Dominik Beutel, Karlsruhe Institute of Technology, Germany
  • Julian Kopfler, Karlsruhe Institute of Technology, Germany
  • Xavier Garcia-Santiago, Karlsruhe Institute of Technology, Germany
  • Carsten Rockstuhl, Karlsruhe Institute of Technology, Germany
  • Martin Wegener, Karlsruhe Institute of Technology, Germany
  • Ivan Fernandez-Corbaton, Karlsruhe Institute of Technology, Germany
<p> We present an achiral and helicity preserving cavity that enhances the infrared vibrational circular dichroism signal of chiral molecules by factors of ten to one hundred. In contrast to many previous designs, the enhancement is mostly achieved in relatively large regions that are spatially separated from the meta-surfaces that form the cavity.</p>
15:15 - 15:30 - PT-symmetric Multilayer Systems: Homogenization And Beam Propagation Oral [Show abstract]
  • Andrey Novitsky, Belarusian State University, Belarus
  • Denis Novitsky, B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Belarus
  • Alexander Shalin, ITMO University, Russia
We reveal that the Maxwell Garnett approximation is not capable of predicting a PT symmetry breaking in multilayers and a nonlocal homogenization theory should be employed. Interaction of electromagnetic beams consisting of plane and evanescent partial waves with the PT-symmetric systems is also studied.
Media link(s):

See arxiv preprint https://arxiv.org/abs/1811.03928

14:00 - Special session on metamaterials for life-science applications (part 1)

Session chairperson(s): Miguel Beruete

14:00 - 14:15 - Ultrasensitive Exceptional Point Circuit for Enhanced Physiological Sensing Oral [Show abstract]
  • Zhenya Dong, National University of Singapore, Singapore
  • John S. Ho, National University of Singapore, Singapore
Exceptional points (EPs) are degeneracies in non-Hermitian systems that have emerged as a new way to tailor the system response. Biasing systems at EPs, in particular, have recently been shown to enhance the sensitivity of certain resonant sensors. Here we demonstrate an EP circuit that enables ultrasensitive readout of wireless physiological health sensors based on LC circuits. We show that this circuit can be automatically operated at an EP and exhibit an amplified response to a small perturbation. In vivo experiments show that enhanced sensitivity can be maintained in dynamic living environments for monitoring of respiratory motion.
14:15 - 14:30 - High-sensitivity Labyrinth Metasurface Working at THz for Thin-film Sensing Oral [Show abstract]
  • Irati Jáuregui-López, Public University of Navarra, Spain
  • Pablo Rodriguez-Ulibarri, Public University of Navarra, Spain
  • Aitor Urrutia, Public University of Navarra, Spain
  • Sergei A. Kuznetsov, Novosibirsk State University, Russia
  • Miguel Beruete, Public University of Navarra, Spain
In this work a so-called labyrinth metasurface sensor working at the terahertz (THz) band is presented. The intricate geometry of the design leads to a high electric field confinement in all the structure surface, leading to ultrasensitive performance for thin-film sensing applications. The structure is coated with extremely thin analytes with thicknesses varying from ha = 24 nm to ha = 345 nm of tin dioxide (SnO2) and its sensing capabilities are numerically and experimentally evaluated. Increasing the analyte thickness leads to a maximum redshift of 8 GHz at the resonance frequency. An average measured sensitivity of 12744.4 GHz/mm·RIU and a measured average FOM of 606.9 (mm·RIU) −1 are obtained, improving previous results found in the literature for designs that have been fabricated with the same manufacturing techniques. The great results obtained can lead to clear advantages for other type of sensing applications, where samples in a thin-film form become essential, such as biological sensing.
14:30 - 15:00 - Hyperbolic Dispersion Metamaterials for Life Sciences Applications Extended oral [Show abstract]
  • Giuseppe Strangi, Case Western Reserve University, USA
<p> In recent years significant efforts have been made to design and fabricate functional nanomaterials for biomedical applications. Optical sensor technology based on plasmonic metamaterials offers significant opportunities in the field of clinical diagnostics, particularly for the detection of lower-molecular-weight (&lt;500 Da) biomolecules in highly diluted solutions. In this context, we have developed miniaturized plasmonic biosensor platforms based on hyperbolic metamaterials supporting highly confined bulk plasmon guided modes that outperform current detection technologies.</p>
15:00 - 15:30 - 3D plasmonic nanostructures and metasurfaces for hybrid biological interfaces with living tissues Invited oral [Show abstract]
  • Giulia Bruno, Istituto Italiano di Tecnologia, Italy
  • Andrea Barbaglia, Istituto Italiano di Tecnologia, Italy
  • Giovanni Melle, Istituto Italiano di Tecnologia, Italy
  • Francesco De Angelis, Istituto Italiano di Tecnologia, Italy
3D plasmonic nanostructures integrated on microfluidic chips enable to create hybrid biological interfaces with living cells. Multiple functionalities such as intracellular delivery, intracellular Raman spectroscopy (plasmon enhanced) and electrical recording of action potentials are demonstrated both on cardiomyocytes and neurons. We successfully explored the possibility of using plasmonic metasurfaces as next generation hybrid biological interfaces.
15:30 - 16:00 - Coffee break (Tuesday afternoon)
16:00 - 18:00 - Oral sessions (Tuesday - afternoon 2)
16:00 - Plasmonics (part 2)

Session chairperson(s): Sergey Bozhevolnyi

16:00 - 16:30 - Strong Light-Matter Coupling in Plasmonic Systems: a Quantum Hydrodynamic Study Extended oral [Show abstract]
  • Cristian Ciraci, Istituto Italiano di Tecnologia, Italy
At sub-nanometer length-scale, nonlocal and quantum effects are expected to influence the interaction between emitters and plasmonic systems, which unavoidably requires to go beyond classical models. Here, we apply state-of-the-art quantum hydrodynamic theory to investigate the quantum effects on strong coupling of a point-dipole emitter placed nearby metallic particles. In order to understand the effects of the quantum hydrodynamic model on the plasmon-emitter coupling, we compare our results with the conventional local response approximation and Thomas-Fermi hydrodynamic theory.
16:30 - 16:45 - Metamaterial-Enhanced Micromechanical Photoswitch for Zero-Power Optical Transceiver Oral [Show abstract]
  • Matteo Rinaldi, Northeastern University, USA
This paper reports on the first demonstration of a micromechanical photoswitch (MP) with an integrated near-infrared metamaterial electromagnetic absorber for zero-power optical transceivers, suitable for the implementation of on-demand free-space optical (FSO) transceiver nodes. The core element of such FSO transceiver nodes is a novel micromechanical photoswitch with an integrated near infrared (NIR) meatamaterial absorber which remains completely dormant with zero-power until woken up on detection of the incoming optical band of interest (e.g., lambda = 1550 nm). The near-perfect absorption characteristics (near-unity absorptance, spectral selectivity and sub-wavelength thickness form factor) of a metamaterial absorber along with the elimination of standby power consumption are key enablers to establish the next generation on-demand FSO communication link for secure and low-power data transmission.
16:45 - 17:15 - Merging Plasmonics And Quantum Photonics Invited oral [Show abstract]
  • Sergey Bozhevolnyi, Centre for Nano Optics, University of Southern Denmark, Denmark
Recent developments in realization of single-photon sources empowered by coupling to localized and propagating surface plasmon modes are presented, paying particular attention to quantum plasmonic circuitry based on dielectric-loaded plasmonic waveguides containing accurately positioned nanodiamonds with colour centres.
17:15 - 17:30 - Quantum Emitter Interacting with a WS2 Layer in the Strong Coupling Regime Oral [Show abstract]
  • Vasileios Karanikolas, University of Patras, Greece
  • Nikos Iliopoulos, University of Patras, Greece
  • Dionisis Stefanatos, University of Patras, Greece
  • Emmanuel Paspalakis, University of Patras, Greece
<p> We investigate the spontaneous emission (SE) properties of a quantum emitter (QE) near a WS2 layer. The QE is placed above the WS2 layer in a host medium with constant dielectric permittivity and below the WS2 layer is either the same host medium or Au. The surface plasmon mode at the dielectric/Au interface interacts with the excitons of the WS2 increasing the Rabi splitting in the SE spectrum of the QE, compared with the dielectric substrate.</p>
17:30 - 17:45 - Magnetic Spin-Locking of Light Oral [Show abstract]
  • Mengjia Wang, FEMTO-ST Institute, France
  • Hongyi Zhang, FEMTO-ST Institute, France
  • Tatiana Kovalevich, FEMTO-ST Institute, France
  • Roland Salut, FEMTO-ST Institute, France
  • Myun-Sik Kim, EPFL, Switzerland
  • Miguel Angel Suarez, FEMTO-ST Institute, France
  • Maria Bernal, FEMTO-ST Institute, France
  • Hans-Peter Herzig, EPFL, Switzerland
  • Huihui Lu, Jinan University, China
  • Thierry Grosjean, FEMTO-ST Institute, France
<p> We show the directional excitation of Bloch surface waves controlled by the optical magnetic field. Relying on the helicity of the optical magnetic field, this magnetic effect is non-negligible even with a non-resonant dielectric scatterer (electric dipole) used as a Bloch surface wave coupler. Magnetic spin-locking opens new degrees of freedom in the manipulation and detection of light.</p>
17:45 - 18:00 - Plasmonic nanoantennas for excitation of ultrafast magnetization dynamics Oral [Show abstract]
  • Daria Sylgacheva, Lomonosov Moscow State University, Russia
  • Mikhail Kozhaev, Russian Quantum Center, Russia
  • Denis Krichevsky, Lomonosov Moscow State University, Russia
  • Vladimir Belotelov, Lomonosov Moscow State University, Russia
Nowadays the coherent excitation of spin ensembles is of prime research importance since it potentially can expand the functionalities of magnonics. In this respect optical tools are very promising due to the possibility to manipulate at ultrashort time scales and to provide local excitation, in particular, by focusing light with plasmonic nanoantennas. In this work, we calculated and measured the optical properties of the plasmonic nanoantenna arrays of subwavelength period and optimized their size and height to get localized surface plasmons suitable for excitation of ultrafast magnetization dynamics.
16:00 - Acoustical and mechanical metamaterials (part 2)

Session chairperson(s): Sarah Benchabane

16:00 - 16:15 - Design of Thermoelastic Metamaterials for Micro-robotics Oral [Show abstract]
  • Qingxiang Ji, Harbin Institute of Technology, CNRS, University of Besancon, France
  • Xueyan Chen, Harbin Institute of Technology, CNRS, University of Besancon, France
  • Jun Liang, Beijing Institute of Technology, China
  • Jingyuan Qu, Karlsruhe Institute of Technology, Germany
  • Philippe Lutz, CNRS, University of Besancon, France
  • Cédric Clévy, CNRS, University of Besancon, France
  • Kanty Rabenorosoa, CNRS, University of Besancon, France
  • Vincent Laude, CNRS, University of Besancon, France
  • Muamer Kadic, CNRS, University of Besancon, France
We design thermoelastic metamaterials for use as actuators for soft micro-robots. We start by designing mechanical metamaterial unit-cells and demonstrating the effective translation and rotation mechanism upon heating. Then, we consider their global behavior at a larger scale and analyze the influence of structural parameters on induced motion. We obtain their motional amplitudes as well as the potential torque/force that should be used to position a given object. The system is controlled by a global thermal source that drives the overall system to a given state.
16:15 - 16:30 - Graded elastic metasurface for enhanced sensing and energy harvesting Oral [Show abstract]
  • Jacopo Maria De Ponti, Politecnico di Milano , Italy
  • Andrea Colombi, ETH Zurich, Switzerland
  • Richard Craster, Imperial College London, United Kingdom
  • Raffaele Ardito, Politecnico di Milano, Italy
  • Francesco Braghin, Politecnico di Milano, Italy
  • Alberto Corigliano, Politecnico di Milano, Italy
Metamaterials offer extraordinary properties to control the propagation of electromagnetic, acoustic and elastic waves in artificially engineered media. Among other properties, resonant metasurfaces made of rod clusters on elastic substrate, have revealed superior characteristic for broadband wave focusing and mode conversion. In this study, the metasurface broadband control capacities are used to design an innovative metasurface, able to focus waves for enhanced piezoelectric sensing and energy harvesting.
16:30 - 17:00 - A New Class Of Body-centered Cubic Shell Lattice Material Extended oral [Show abstract]
  • Xueyan Chen, Femto-st, CNRS, France
  • Qingxiang Ji, Femto-st, CNRS, France
  • Huifeng Tan, Harbin Institute of Technology, P.R. China
  • Vincent Laude, fFmto-st, CNRS, France
  • Muamer Kadic, Femto-st, CNRS, France
<p> Recently, scientist have shown that body-centered cubic (BCC) lattice materials, the best-known bending-dominated metamaterials, can absorb more energy than commercially available aluminum foams. Such metamaterials, however, lack scalability toward extremely low densities – instabilities disappear together with the stiffness and strength. Here, we design a stretching-dominated mechanical metamaterial that can absorb very large energies while retaining a low density. In this study, a few examples of metamaterials are considered and we show that a new class of shell lattice (SL) metamaterials has the best mechanical properties for shock absorption – they are ultrastiff, ultrastrong, and possess high specific energy absorption at low relative density.</p>
17:00 - 17:30 - Observation of Mechanical Activity in a 3D Metamaterial Extended oral [Show abstract]
  • Tobias Frenzel, Karlsruhe Institute of Technology, Germany
  • Julian Köpfler, Karlsruhe Institute of Technology, Germany
  • Erik Jung, Karlsruhe Institute of Technology, Germany
  • Muamer Kadic, Karlsruhe Institute of Technology and Université de Bourgogne, Germany and France
  • Martin Wegener, Karlsruhe Institute of Technology, Germany
<p> Using 3D chiral cubic-symmetry microstructured polymer metamaterial beams, we present comprehensive experiments on mechanical activity, the counterpart of optical activity. We study the dependence on frequency in the range 20-180 kHz, on propagation length, and on the beam cross section. Our findings are in good agreement with theory.</p>
17:30 - 18:00 - Poisson’s ratio of Yukawa systems with nanoinclusions: nanochanel vs nanolayer Invited oral [Show abstract]
  • Konstantin Tretiakov, Institute of Molecular Physics Polish Academy of Sciences, Poland
  • Jakub Narojczyk, Institute of Molecular Physics Polish Academy of Sciences, Poland
  • Pawel Piglowski, Institute of Molecular Physics Polish Academy of Sciences, Poland
  • Krzysztof Wojciechowski, Institute of Molecular Physics Polish Academy of Sciences, Poland
The influence of periodically distributed inclusions on elastic properties of crystals in which particles interact through Yukawa potential is discussed briefly. The inclusions in the form of channels oriented along the [001]-direction and layers orthogonal to the [010]-direction are considered. Monte Carlo simulations have shown that, depending on the type of inclusion and the concentration of inclusion particles in Yukawa crystal, qualitative changes in elastic properties occur. In particular, in selected directions, one observes for systems with nanolayers an appearance of auxetic properties and for systems with nanochannels an enhancement of auxeticity.
16:00 - Special Session: Physical Review Journals Symposium

Session chairperson(s): Andrea Alu

16:00 - 16:30 - Exploration of Microwave Edge Modes on a Metasurface with Glide Symmetry Invited oral [Show abstract]
  • Julia D. de Pineda, University of Exeter, United Kingdom
  • Alastair P. Hibbins, University of Exeter, United Kingdom
  • J. Roy Sambles, University of Exeter, United Kingdom
<p> In this work we discuss the modes supported by a planar metasurface comprised of two layers of circular metal patches that form two identical hexagonal arrays. The layers are stacked together but displaced with respect to each other and separated by a dielectric slab. In our study, each metasurface is infinitely periodic in one direction (x) but only a few periods wide in the orthogonal direction (y). By modelling and experiment, we find the existence of a localized edge mode that only appears for a certain relative displacement of the layers. This edge mode is later used to guide the propagation of electromagnetic energy around different shapes, including sharp corners.</p>
16:30 - 17:00 - Optomechanical Kerker effect Invited oral [Show abstract]
  • Alexander Poddubny, Ioffe Institute, Russia
  • Ivan Avdeev, Ioffe Institute, Russia
  • Alexander Poshakinskiy, Ioffe Institute, Russia
We consider theoretically an interaction of light with vibrations of nanoparticles and membranes, supporting optical resonances. We predict strong directionality of the inelastic scattering of light on the nanoparticles trembling in space. Tunable directional forward or backward inelastic scattering can be achieved even for a particle lacking magnetic resonances due to the vibration-induced conversion between electric and magnetic dipole modes. We also put forward optomechanical crumpling and tension effects, manifested in a modification of resonant membrane shape by light.
17:00 - 17:30 - Negative Stiffness Inclusions as a Platform for Real-Time Tunable Phononic Metamaterials Invited oral [Show abstract]
  • Lorenzo Valdevit, Univ. of California Irvine, USA
We propose an approach for real-time manipulation of low-frequency phononic band gaps in a metamaterial without affecting the material geometry, microarchitecture, or the crystal structure of the base material. Metamaterials with tunable band gaps are realized by introducing periodically arranged negative stiffness inclusions, the modulus of which can be varied in time in order to modify the metamaterial macroscopic stiffness in certain directions, without bringing the material to the point of elastic instability or inducing extreme geometric change. The evolution of band gaps is investigated numerically, and the proposed concept is verified experimentally in a lattice prototype with magnetic elements functioning as negative stiffness units. Design guidelines for achieving real-time tunable phononic band gap are also presented.
17:30 - 18:00 - Chiral Properties of Light in Material Systems Invited oral [Show abstract]
  • J. Enrique Vazquez-Lozano, Universitat Politecnica de Valencia, Spain
  • Alejandro Martinez, Universitat Politecnica de Valencia, Spain
<p> Motivated by recent theoretical results concerning dynamical properties of light in dispersive and lossless media, here we address an alternative derivation for the optical chirality, extending it so as to include dissipative effects as well. Looking into the underlying mathematical structure of the continuity equation, we find a new general expression for the optical chirality density in dispersive and lossy media. In spectral regions with high absorption and anomalous dispersion, we observe important deviations in comparison with the lossless case. This fact should be carefully accounted for and examined when analyzing the optical chirality and its interaction with matter, mainly in the context of highly dispersive systems such as plasmonic nanostructures and metamaterials, whose chiral properties are receiving strong attention.</p>
16:00 - Modelling (part 1)

Session chairperson(s): Carsten Rockstuhl

16:00 - 16:15 - Nonreciprocal Metagratings Oral [Show abstract]
  • Younes Ra'di, Advanced Science Research Center, City University of New York, USA
  • Andrea Alu, Advanced Science Research Center, City University of New York, USA
We introduce the concept of nonreciprocal metagratings. We study surfaces that can enable nonreciprocal energy transfer between multiple Floquet channels. These surfaces are fully periodic arrays of nonreciprocal bianisotropic particles that can enable nonreciprocal wave manipulation with unitary efficiency. Notably, we study metagratings with bianisotropic moving particles as their building blocks. These bianisotropic particles are in fact stationary, however from electromagnetic point of view they emulate the characteristics of a real moving particles. As a possible application, we derive the required electric, magnetic, and electromagnetic polarizabilities of the bianisotropic moving particles for a metagrating capable of nonreciprocal space wave circulation with unitary efficiency.
16:15 - 16:30 - The Rayleigh Hypothesis for Metasurface Optimization: Anomalous Grazing Refraction by Corrugated Silicon Oral [Show abstract]
  • Maxim Gorkunov, FSRC , Russia
  • Alexander Antonov, FSRC "Crystallography and Photonics", Russia
We study dielectric metasurfaces based on periodically corrugated subwavelength-thin silicon layers and explore their ability to control the light propagation direction. We apply the Rayleigh hypothesis that drastically facilitates the evaluation of diffraction efficiencies and perform a multi-parametric numerical optimization of the optical performance. In particular, we adjust the Fourier coefficients of periodic profiles to achieve anomalous refraction of normally incident light into grazing directions with an efficiency of more than 70%.
16:30 - 17:00 - Non-Scattering Multi-Mirror Systems for Field Localization Extended oral [Show abstract]
  • Francisco Cuesta, Aalto University, Finland
  • Viktar Asadchy, Aalto University, Stanford University, Finland, United States of America
  • Mohammad Sajjad Mirmoosa, Aalto University, Finland
  • Sergei Tretyakov, Aalto University, Finland
Resonators composed of two mirrors, such as Fabry-Perot cavities, provide a simple but effective approach to achieve wave transmission with high finesse. Further increase of the quality factor requires reflectors with higher conductivity or multi-mirror solutions. However, the analytical complexity of resonators with more than two mirrors prevents the design of optimal structures without recurring to numerical methods. This work considers an alternative approach to this problem by using cavities which do not produce any electromagnetic scattering. We demonstrate that these invisible cavities can be placed inside one another, resulting in a ``matryoshka-doll''-like resonator. The standing-wave distribution of the inner resonator can be controlled without disturbing that of the outer one, whereas the whole system remains non-scattering.
Media link(s):

This work is based on our previous discoveries, which can be read here.

17:00 - 17:15 - Upper Bound for the Light Absorption in a Nanovolume Assisted by a Nanoantenna Oral [Show abstract]
  • Emilie SAKAT, LCF(CNRS), France
  • Léo Wojszvzyk, LCF(CNRS), France
  • Jean-Jacques Greffet, LCF(CNRS), France
  • Jean-Paul Hugonin, LCF(CNRS), France
  • Christophe Sauvan, LCF(CNRS), France
We derive a fully-vectorial upper bound for the absorption cross-section of a nanoparticle in a complex environment. It is valid for any environment and any illumination and allows to decouple the choice of the environment from the one of the absorber. It provides a meaningful figure of merit to compare the ability of different systems to enhance absorption.
17:15 - 17:30 - Investigation of surface waves on anisotropic self-complementary metasurfaces Oral [Show abstract]
  • Vladimir Lenets, ITMO University, Russia
  • Andrey Sayanskiy, ITMO University, Russia
  • Stanislav Glybovski, ITMO University, Russia
  • Enrica Martini, University of Siena, Italy
  • Juan Baena, Universidad Nacional de Colombia, Colombia
  • Stefano Maci, University of Siena, Italy
In this work, we numerically study propagation and excitation of surface waves on a resonant and anisotropic self-complementary metasurface in the microwave range. We show that the TE- and TM-polarized fundamental modes have identical dispersion relations in different directions of propagation. Moreover, it is demonstrated that anisotropy of the metasurface results in very different group velocities in two mutually orthogonal propagation directions for both polarizations, which allows unidirectional and localized excitation.
17:30 - 17:45 - Analysis of Resonances in Periodic Metasurfaces through the Concept of Self-Coupling Mode Oral [Show abstract]
  • Kevin Müller, École Polytechnique fédérale de Lausanne, Switzerland
The concept of self-coupling modes, which are eigen-vectors of the roundtrip matrix, is introduced. I investigate its use for the identification and analysis of the resonances taking place in periodic metasurfaces. It also improves the interpolation of the response of a resonant metasurface.
17:45 - 18:00 - Multipole analysis of bound states in the continuum supported by a periodic array of spheres Oral [Show abstract]
  • Zarina Sadrieva, ITMO University, Russia
  • Andrey Bogdanov, ITMO University, Russia
We study dielectric metasurfaces composed of planar periodic arrays of Mie-resonant nanospheres which support both symmetry protected and accidental bound states in the continuum, and employ the multipole decomposition and symmetry approach to reveal the physical mechanism of the formation of such nonradiating states in terms of multipolar moments.
18:00 - 19:00 - Meet-and-greet the Physical Review Editors
18 September 2019 / Start time: 9 h 0 min
09:00 - 10:00 - Plenary session III
09:00 - Plenary session III

Session chairperson(s): Martin Wegener

09:00 - 10:00 - Chiral and Topological Surface Waves and Line Waves on Metasurfaces Plenary [Show abstract]
  • Daniel Sievenpiper, UCSD, USA
The use of symmetry in electromagnetic structures provides a means for manipulating wave propagation. Line waves can occur at the interface between complementary metallic screens. At optical frequencies, similar structures can be produced with arrangements of holes in a dielectric substrate. Various techniques for designing topological structures will be discussed.
10:00 - 10:30 - Coffee break (Wednesday morning)
10:30 - 12:30 - Oral sessions (Wednesday morning)
10:30 - Special session on topological band gaps in metamaterials (part 3)

Session chairperson(s): Simon Horsley

10:30 - 11:00 - Non-Hermitian sonic second-order topological insulator No show [Show abstract]
  • Johan Christensen, UC3M, Spain
<div> Topological phases of matter that have been recently extended to topological phases of sound, can confine acoustic energy at the corners of higher-order topological insulators. We broaden this concept by incorporating parity-time symmetry and show new topologically protected confinement rules that are dictated by the geometrical arrangement of gain and loss units. Particularly, our findings reveal how sound trapping occurs at all corners when parity-time symmetry is intact, beyond the exceptional point within the broken phase however, opposite corners sustain either sink- or source-like states that could lead to novel non-Hermitian guides for sound.</div>
Media link(s):

Non-Hermitian sonic second-order topological insulator

11:00 - 11:30 - Edge States and Topological Pumping in Spatially Modulated Elastic Lattices Invited oral [Show abstract]
  • Massimo Ruzzene, Georgia Institute of Technology, USA
  • Matheus Rosa, Georgia Institute of Technology, United States
One-dimensional elastic lattices with spatial modulations of stiffness are shown to exhibit non-trivial topological properties that lead to the existence of edge states. Topological pumping is achieved by modulations of the stiffness phase in a system of coupled elastic beams driving an edge-to-edge transition of the topological modes.
11:30 - 12:00 - Solving differential equations with topological acoustic metamaterials Extended oral [Show abstract]
  • Farzad Zangeneh=Nejad, EPFL, Switzerland
  • Romain Fleury, EPFL, Switzerland
The conventional idea of analog computing has recently been revived by recent developments of the fields of metamaterials and ultrafast optics, allowing one to perform signal-processing tasks at the speed of wave propagation with high efficiency. Despite these advantageous features, the functionality of such wave-based computing systems, like any other analog system, is mitigated by the sensitivity and geometrical tolerances of analog components, causing uncertainties in the computation process. Here, we propose the possibility of significantly enhancing the reliability of wave-based computing by leveraging the protection of topological insulators. We believe that our theoretical and experimental findings open the venue for further explorations that unify the field of topological insulators with the fields of linear system theory and signal processing.
12:00 - 12:15 - Guided water waves along a domain wall in a Quantum Valley Hall Effect (QVHE) crystal Oral [Show abstract]
  • Nicolas Laforge, FEMTO-ST, France
  • Vincent Laude, FEMTO-ST, France
  • Franck Chollet, FEMTO-ST, France
  • Abdelkrim Khelif, FEMTO-ST, France
  • Muamer Kadic, FEMTO-ST, France
  • Yuning Guo, Ecole Polytechnique Fédérale de Lausanne, Switzerland
  • Romain Fleury, Ecole Polytechnique Fédérale de Lausanne, Switzerland
Topological phases of matter have been recently extended to classical wave systems such as optics or phononics. Here, we show for the first time an experimental demonstration of topological edge states in a classical water wave system supporting highly non-linear wave dispersion, in the intermediate regime of gravity-capillary waves.
12:15 - 12:30 - Self-induced Topological Transition in a Nonlinear Phononic Lattice Oral [Show abstract]
  • Rajesh Chaunsali, LAUM, CNRS, Le Mans Université, France
  • Georgios Theocharis, LAUM, CNRS, Le Mans Université, France
<p> We present a scheme by which a nonlinear phononic crystal can transition from a topologically trivial state to a nontrivial state and vice-versa, simply by changing the excitation amplitude. In this process, we report the existence of kink solitons in the transition regime. Also, we observe a unique edge mode emerging in the nontrivial regime that looks different from its linear counterpart.</p>
10:30 - Non-linear, tunable and reconfigurable metamaterials (part 2)

Session chairperson(s): Mihail Petrov

10:30 - 10:45 - Active Metasurfaces as a Platform for Capacitive Wireless Power Transfer Supporting Multiple Receivers Oral [Show abstract]
  • Fu Liu, Aalto University, Finland
  • Prasad Jayathurathnage, Aalto University, Finland
  • Sergei Tretyakov, Aalto University, Finland
<p> We show that active metasurfaces can work as transmitters of capacitive wireless power transfer (WPT) systems. It can feed multiple receivers and provide robust operation against load or position variations. We formulate an analytical model for such WPT systems and discuss exact solution of a example with N identical receivers.</p>
10:45 - 11:00 - Optimal Analog Data Compression with Reconfigurable Wave-Chaotic Systems Oral [Show abstract]
  • Philipp del Hougne, Institut de Physique de Nice, France
  • Fabrice Mortessagne, Institut de Physique de Nice, France
  • Olivier Legrand, Institut de Physique de Nice, France
  • Ulrich Kuhl, Institut de Physique de Nice, France
Propagation of waves through wave-chaotic systems completely scrambles incident wave fronts. Recent computational imaging devices leverage this property to take compressed measurements of multiple input data streams. Here, we demonstrate that carefully configured wave-chaotic systems can optimally compress multiple incoming data streams. Using tunable metasurfaces, we reconfigure the boundary conditions of chaotic microwave cavities and report an experimental in-situ proof of the concept.
11:00 - 11:15 - Nonlinear Distortion of Multitone Wave Packets by Lossy Conductors Oral [Show abstract]
  • Alex Schuchinsky, University of Liverpool, United Kingdom
  • Michael Steer, NC State University, USA
The presented new approach enables efficient multiphysics modelling of the products of nonlinear mixing in multi-carrier wave packets and reveals their fundamental properties. The developed methodology is illustrated by an example of distortion of the multi-tone wave packets due to the electro-thermal nonlinearity of a surface with finite conductivity.
11:15 - 11:30 - Controlling Surface Acoustic Waves via Magnetically-modulated Contact Resonances Oral [Show abstract]
  • Antonio Palermo, University of Bologna; California Institute of Technology, Italy
  • Yifan Wang, California Institute of Technology, USA
  • Paolo Celli, California Institute of Technology, USA
  • Chiara Daraio, California Institute of Technology, USA
We present a tabletop-scale realization of a tunable metamaterial platform to control surface acoustic waves (SAWs). The platform comprises an array of ferromagnetic beads controlled with permanent magnets, arranged atop an elastic substrate. We demonstrate the possibility of shifting the beads’ resonances and, in turn, tuning the SAWs bandgaps.
11:30 - 11:45 - Phase-Gradient Metasurfaces Based on a Photosensitive Chalcogenide Glass Oral [Show abstract]
  • Elena Mikheeva, Aix Marseille Univ., France
  • Julien Lumeau, Aix Marseille Univ., France
  • Redha Abdeddaim, Aix Marseille Univ., France
  • Ivan Voznyuk, Multiwave Innovation SAS, France
  • Stefan Enoch, Aix Marseille Univ., France
<p> We suggest a realistic design of phase-gradient metasurfaces made of photosensitive chalcogenide ($As_2S_3$) using the effect of suppressed back-scattering due to modes interference within dielectric particles. We calculate 4 meta-atoms producing phase shifts of $0$, $pi/2$, $pi$, and $3pi/2$ with respect to each other for simulating a micro-lens with a discrete phase profile. Our result confirms the possibility to produce larger diffractive optical elements (DOE) based on photo-sensitivity which has technological advantage of recording the desired phase profile as a post-fabrication step.</p>
11:45 - 12:00 - Blueshift in graphene-based hyperbolic metamaterials as a tunable narrowband reflection modulators Oral [Show abstract]
  • Alessandro Pianelli , Military University of Technology, Poland
  • Rafal Kowerdziej, Military University of Technology, Poland
  • Marek Olifierczuk, Military University of Technology, Poland
  • Karol Sielezin, Military University of Technology, Poland
  • Michal Dudek, Military University of Technology, Poland
  • Janusz Parka, Military University of Technology, Poland
<p> We examine numerically the hyperbolic metamaterials based on graphene in the mid-IR frequencies. Using the capability to tune the hyperbolic dispersion of graphene-based HMM by varying the chemical potential, we report a blueshift and tunability of the reflectance particularly for different incident angles in TM/TE modes. A type I, type II hyperbolic dispersion, as well as an effective metallic dispersion, are shown for three different structures taken into consideration.</p>
12:00 - 12:15 - An Ultra-thin Reconfigurable Polarization Converter Based on an Active Metasurface No show [Show abstract]
  • Long Li, Xidian University, China
  • Guangyao Liu, Xidian University, China
  • Jiaqi Han, Xidian University, China
  • Yajie Mu, Xidian University, China
  • Haixia Liu, Xidian University, China
In this paper, a novel reconfigurable polarization converter (RPC) based on active metasurface tuned by positive-intrinsic-negative (PIN) diodes is proposed. The metasurface unit cell of the RPC consists of a hexagonal patch and three triangle patches, which are all etched on a substrate backed by a metal ground. In the conversion mode, the linear polarization (LP) along the y-axis can be converted into a left-hand circularly polarized (LHCP) wave and a righthand circularly polarized (RHCP) wave by switching the diodes' states. On the other hand, in the reflection mode, the incident wave is reflected with the original polarization in the corresponding frequency band. The thickness of this metasurface is only 1.5mm and it has great potential applications.
12:15 - 12:30 - Non-Linear High Permittivity Artificial Dielectric Oral [Show abstract]
  • Juan P. del Risco, Universidad Nacional de Colombia, Colombia
  • Juan D. Baena, Universidad Nacional de Colombia, Colombia
In this work we study the non-linearity effects for a high permittivity artificial dielectric which result from the stacking of many parallel layers each one made of square metallic patches arranged on a square lattice. From the balance between the attractive electric force between induced charges and the restoring force caused by some soft dielectric spacers, we have found strong non-linear effects on the effective permittivity.
10:30 - Millimeter wave and microwave metamaterials

Session chairperson(s): Samel Arslanagic

10:30 - 10:45 - Varactor-Loaded Metagratings For The Dynamic Manipulation Of The Diffracted Waves Oral [Show abstract]
  • Andrea Casolaro, Roma Tre University, Italy
  • Alessandro Toscano, Roma Tre University, Italy
The ability of metagratings to perform extreme wavefront manipulation allowed them to cover a wide range of functionalities in different frequency ranges, from microwave to optics. However, in nowadays applications, reconfigurable devices are often required. In this contribution we present a metagrating enabling the dynamic control of the total diffraction pattern, both in reflection and transmission, using arrays of varactor-loaded strips. First, we analyze the static case of capacitively loaded strips and show how it is possible to control the power carried by each diffraction order by properly tuning the load capacitances. Second, we employ varactor diodes to achieve reconfigurability using a resistive bias network. The developed design procedure is validated through numerical simulations and the effect of losses is also discussed.
10:45 - 11:00 - Free-Space Layered Sheet-Isolator Oral [Show abstract]
  • Rodion Kononchuk, University of Texas at San Antonio, USA
  • Carl Pfeiffer, Air Force Research Laboratory, USA
  • Nicholaos Limberopoulos, Air Force Research Laboratory, USA
  • Igor Anisimov, Air Force Research Laboratory, USA
  • Ilya Vitebskiy, Air Force Research Laboratory, USA
  • Andrey Chabanov, University of Texas at San Antonio, USA
We introduce a multilayer acting as a free-space sheet-isolator with unlimited aperture, strong resonant transmission in the forward direction, and a possibility of broadband omnidirectional rejection of light incident on the opposite (back) side of the multilayer.
11:00 - 11:15 - Experiments on the External Coupling Control of a Dirac Cone Metasurface for Extraordinary Transmission Oral [Show abstract]
  • Yuto Kato, National Institute of Advanced Industrial Science and Technology, Japan
  • Atsushi Sanada, Osaka University, Japan
We experimentally study an external coupling control of a double-sided Dirac cone metasurface by adjusting the unit cell density to realize the extraordinary transmission with enhanced transmittance. The gain enhancement with an optimized Dirac cone metasurface with the Γ-point frequency of 28 GHz is demonstrated.
11:15 - 11:30 - Novel Metasurface Synthesis Algorithm Based On Near-Field Coupling Analysis Oral [Show abstract]
  • Andreas Eduard Olk, University of New South Wales Sydney, Australia
  • David Anthony Powell, University of New South Wales Sydney, Australia
Metasurfaces in the microwave and terahertz frequency range are most often composed of several metallic layers with dielectric spacing, which are modeled as cascaded impedance sheets for the synthesis. This widely used model can be significantly inaccurate as it does not account for perturbations caused by near-field coupling between metallic layers. In this work, we use a novel synthesis algorithm that is capable of correcting these perturbations and allows the design of transmissive metasurfaces with high efficiency despite the presence of near-field coupling. Different numerical and experimental examples are presented including beam refraction and a flat lens operating at mm-wave frequencies (W-band).
11:30 - 12:00 - Water-Based Microwave Metasurfaces and Electrically Small Antennas Invited oral [Show abstract]
  • Samel Arslanagic, Technical University of Denmark, Denmark
  • Jonas Ø. Nielsen, Technical University of Denmark, Denmark
  • Rasmus E. Jacobsen, Technical University of Denmark, Denmark
  • Andrei V. Lavrinenko, Technical University of Denmark, Denmark
<p> Recently, it was proposed to use pure water for resonant inclusions in practical all-dielectric metasurfaces with highly tunable dynamic properties. In this work, we review our recent numerical and experimental efforts on simple water-based microwave metasurfaces for switching, waveguiding, and reflect-array applications. We also illustrate how a single resonant water inclusion can form the basis for interesting electrically small antennas.</p>
12:00 - 12:30 - Manipulating electromagnetic waves with high-efficiency transmissive metasurfaces Invited oral [Show abstract]
  • Lei Zhou, Fudan University, China
The unrestricted control of circularly polarized (CP) waves is highly desired both in science and applications, but conventional devices suffer from issues of bulky size and low efficiency. Although Pancharatnam–Berry (PB) metasurfaces have shown strong capabilities to control CP waves, most transmission-mode PB plasmonic meta-devices suffer from low efficiency issue, limiting their practical applications. In this talk, we will present our serial works on realizing ultrathin transmissive PB metasurfaces to efficiently manipulate CP EM waves at different frequencies. We first derive a general criterion, obtained from Jones-Matrix analyses, for realizing 100%-efficiency ultrathin PB metasurfaces, and then experimentally demonstrate the concept in both microwave and terahertz regimes, and finally realize several high-performance PB meta-devices which can efficiently control CP waves in different frequency domains, including vortex-beam generators and background-free CP Bessel beam generators. Our findings open a novel avenue to freely manipulate CP wave, laying a solid basis for future practical applications such as molecular control and bio-imaging.
10:30 - Homogenization

Session chairperson(s): Graeme Milton

10:30 - 11:00 - Towards Generalized Nonlocal Constitutive Relations For Metamaterials Extended oral [Show abstract]
  • Fatima Z. Goffi, Karlsruhe Institute of Technology, Germany
  • Karim Mnasri, Karlsruhe Institute of Technology, Germany
  • Michael Plum, Karlsruhe Institute of Technology, Germany
  • Carsten Rockstuhl, Karlsruhe Institute of Technology, Germany
We consider a nonlocal homogenization to describe the propagation of light within metamaterials. To this end, we use Taylor and Padé-type approximations of the response function of E. We discuss the dispersion relations, the additional interface conditions, study and compare the emerging reflection and transmission coefficients from slabs of metamaterials.
11:00 - 11:30 - Quasiperiodic Composites: Two-scale Reiterated Homogenization Invited oral [Show abstract]
  • Elena Cherkaev, University of Utah, USA
  • Sebastien Guenneau, Aix-Marseille Universite, France
  • Harsha Hutridurga, Indian Institute of Technology Bombay, India
  • Niklas Wellander, Swedish Defence Research Agency, Sweden
Quasiperiodic materials present a novel class of metamaterials that possess unusual, extraordinary mechanical, thermal and electromagnetic properties. We derive homogenized equations for the effective behavior of multiscale composites with mixtures of periodic and quasiperiodic phases appearing at different scales and discover new effects which could have interesting applications for control of wave and diffusion phenomena.
11:30 - 11:45 - Homogenisation and spatial dispersion: Using the constitutive relations in the time domain. Oral [Show abstract]
  • Jonathan Gratus, Lancaster University and the Cockcroft Institute, United Kingdom
  • Paul Kinsler, Lancaster University and the Cockcroft Institute, United Kingdom
Standard methods of homogenisation and calculating the effective electromagnetic constitutive relations fail in the presence of spatial dispersion. We show using how we can use an time domain kernel approach in order to calculate the spatially dispersive constitutive relations. This is compared to an eigenvalue approach.
11:45 - 12:00 - Homogenization of All-Dielectric Metasurfaces: Theory and Applications Oral [Show abstract]
  • Alessio Monti, Niccolò Cusano University, Italy
  • Andrea Alù, CUNY Advanced Science Research Center, USA
  • Alessandro Toscano, Roma Tre University, Italy
  • Filiberto Bilotti, Roma Tre University, Italy
In this contribution, we describe a simple and powerful analytical approach to homogenize all-dielectric metasurfaces. The proposed model is based on a combination of the Mie scattering theory of the individual scatterer with a bi-dimensional homogenization approach accounting for the interaction between the electric and magnetic dipoles excited by the external field. Through full-wave simulations, we show that the proposed approach is able to effectively characterize the electromagnetic response of an array of Mie resonators, even for small inter-element separation distances. Several applications of analytically-designed all-dielectric metasurfaces at optical and microwave frequencies are also discussed.
12:00 - 12:30 - On static chiral Willis continuum mechanics Invited oral [Show abstract]
  • Muamer Kadic, UBFC, FEMTO-ST, CNRS, France
  • André Diatta, KIT, Germany
  • Tobias Frenzel, KIT, Germany
  • Sebastien Guenneau, Fresnel Institute, CNRS, France
  • Martin Wegener, KIT, Germany
We discuss the Willis equations as a generalization of Cauchy continuum mechanics towards chiral elastic media. We show that this generalization is able to qualitatively describe recent static experiments on 3D chiral cubic-symmetry metamaterials by introducing a single additional parameter with respect to Cauchy elasticity. It is therefore an interesting alternative to Eringen continuum mechanics, in which nine additional parameters appear.
12:30 - 14:00 - Lunch break (Wednesday)
14:00 - 16:00 - Poster session and Cofee Break (Wednesday afternoon 1)
14:00 - Poster session

Session chairperson(s): Stefano Vellucci; Angelica Viola Marini

1 - New Design of Metamaterial Antenna for 5G Applications No show [Show abstract]
  • Mondher Labidi, innovcom, Tunisia
  • Fethi Choubani, innovcom, Tunisie
The goal of this work is to present a new structure of metamaterial antenna based on split ring resonator which is optimized to operate at 5G band. The proposed antenna is characterized by a compact size of 0.500.390 with a -10 dB wide bandwidth of 4.36 GHz (15.57%) from 27 GHz to 31.36 GHz. The proposed con guration achieves a gain and a directivity enhancement to be 3.69 dB and 5.7 dB respectively. Moreover, a new technique is detailed to make our antenna recon gurable and a frequency shift can be controlled by changing the slot position.
2 - Experimental Validation of Very High Gain Antennas Based on Modulated Metasurfaces Poster [Show abstract]
  • Enrica Martini, University of Siena, Italy
  • Gabriele Minatti, Wave Up Srl, Italia
  • Francesco Caminita, Wave Up Srl, Italia
  • Cristian Della Giovampaola, Wave Up Srl, Italy
  • Stefano Maci, University of Siena, Italy
This contribution presents the design, realization and experimental validation of very high gain modulated metasurface antennas. The design is performed with a systematic procedure based on an equivalent impedance model. The equivalent impedance is then implemented by properly sizing/shaping electrically small patches printed on a grounded dielectric slab. Antennas with different pattern shape, stringent side lobe requirements and very high gain are realized and experimentally characterized, showing very good performance and a remarkable agreement with simulations
3 - Silicon-Based 0.450-0.475 THz Series-Fed Double Dielectric Resonator On-Chip Antenna Array Based on Metamaterial Properties for Integrated-Circuits Poster [Show abstract]
  • Mohammad Alibakhshikenari, University of Rome “Tor Vergata”, Italy
  • Bal S. Virdee, London Metropolitan University, United Kingdom
  • Chan H. See, Edinburgh Napier University, United Kingdom
  • Raed Abd-Alhameed, University of Bradford, United Kingdom
  • Ernesto Limiti, University of Rome “Tor Vergata”, Italy
<p> The antenna array designed to operate over 0.450-0.475 Terahertz comprises two dielectric resonators (DRs) that are stacked vertically on top of each other and placed on the surface of the slot antenna fabricated on a silicon substrate using standard CMOS technology. The slot created in the silicon substrate is meandering and is surrounded by metallic via-wall to prevent energy dissipation. The antenna has a maximum gain of 4.5dBi and radiation efficiency of 45.7% at 0.4625 THz. The combination of slot and vias transform the antenna to a metamaterial structure that provides a relatively small antenna footprint. The proposed series-fed double DRs on-chip antenna array is useful for applications in THz integrated circuits.</p>
4 - Frequency Reconfigurable Based Antenna Utilizing Coding Meta-surface for Future 5G Applications Poster [Show abstract]
  • Mahmoud Abdalla, Military Technical College, Egypt
  • Islam Abdelazeem, Sohag University, Egypt
  • Ahmed Ibrahim, Minia University, Egypt
<p> This paper introduces design of reconfigurable antenna to operate at 27 GHz for future 5 G applications using coding metasurface. The frequency reconfigurable coding metasurface (FRCMS) antenna is composed of conventional patch antenna with rectangular shape printed on a circular substrate as well as a circular coding metasurface with the same diameter of 15 mm (1.35 λ0). By placing the coding metasurface above the conventional patch antenna, the FRCMS antenna introduces compact size and low profile (thickness = 1.2 mm (0.108 λ0). The coding metasurface is composed of four square-loop unit cells. These cells have diagonal strip oriented periodically in both of the vertical and horizontal directions. The operating resonant frequency can be changed by rotating the coding metasurface unit cells mechanically around its center by 90º, which change the overall code sequence of coding metasurface. The coding metasurface works as a dielectric substrate and by rotating it, the code sequence is changed which affects the equivalent relative permittivity of the substrate and hence the resonate frequency of the FRCMS antenna. The FRCMS antenna achieved tunability range from 26.68 GHz to 27.27 GHz also a high realized gain and bandwidth of more than 7 dBi and 600 MHz, respectively, within the tuning range.</p>
5 - Frequency Tunable Monopole Patch Antenna Using Broadside Coupled Split Ring Resonator for Wireless Communication Applications Poster [Show abstract]
  • Joe Kizhakooden, University of Calicut, India
  • Jovia Jose, University of Calicut, India
  • Nees Paul, University of Calicut, India
  • Jolly Andrews, University of Calicut, India
  • Joseph V P, University of Calicut, India
<p> This paper presents metamaterial based monopole patch antenna capable of tuning the radiating frequency over a wide bandwidth. The proposed novel antenna structure makes use of the metamaterial properties of Broadside Coupled Split Ring Resonator (BCSRR) for frequency tuning. The magnetic resonant frequency of the proposed antenna can be tuned by slightly adjusting the interplanar distance between the rings of the BCSRR so that the coupling due to effective capacitance and inductance between them can be changed. The desired range of frequency tuning for potential applications like Global System for Mobiles (GSM), Bluetooth, Wi-Fi, Wi-Max, WLAN etc. is achieved by proper designing of the geometrical parameters of BCSRR. The different antennas for different applications in a single device can be replaced with the proposed novel metamaterial based antenna structure.</p>
6 - Nonstandard FDTD Realization of Radiation Behaviour of Epsilon Negative Metamaterial Corner Reflector Antenna Poster [Show abstract]
  • Jovia Jose, Christ college (autonomous), India
  • Sikha K. Simon, Christ college (autonomous), India
  • Joe Kizhakooden, Christ college (autonomous), India
  • Jolly Andrews, Christ college (autonomous), India
  • Joseph V. P. , Christ college (autonomous), India
<p> The radiation behaviour of a corner reflector antenna designed using epsilon negative (ENG) artificial wire medium is realized using nonstandard Finite Difference Time Domain (NS-FDTD) method and the results are compared with standard FDTD algorithm. High accuracy NS-FDTD algorithm which requires less iteration for convergence is for the first time implemented for metamaterial corner reflector antenna. This is achieved by extending this powerful algorithm by addressing the stability related issues in conducting media and the proposed work may find potential applications in the simulation studies of dispersive and metamaterial designs.</p>
7 - Conductivity Effect on Broadband Dipole Antenna with Split Ring Resonators Poster [Show abstract]
  • Kam Eucharist Kedze, Ajou University, Korea (South)
  • Heesu Wang, Ajou University, Korea (South)
  • Ikmo Park, Ajou University, Korea (South)
A composite broadband dipole antenna printed with different conductivities is presented. The antenna is composed of two identical split ring resonators surrounding each arm of a dipole element. Characteristics of the antenna, including reflection coefficient, gain, and radiation efficiency to different conductivities, are investigated.
8 - Antireflective coatings for high impedance jumps Poster [Show abstract]
  • Julian D. Mateus, Universidad Nacional de Colombia, Colombia
  • Herbert Vinck Posada, Universidad Nacional de Colombia, Colombia
  • Juan D. Baena, Universidad Nacional de Colombia, Colombia
The problem of low microwave transmittance from vacuum to high-permittivity dielectrics is reviewed starting from simple geometries such as spheres and cubes of subwavelength dimensions forming a two-dimensional square lattice. The problem is modeled with effective surface admittances at the interface and a circuit model also is proposed. It is shown that the geometries can be optimized to achieve transmittance near to 1 at different frequencies. A unit cell made of zero thickness perfect electric conductor and lossless dielectric is designed to reduce the reflectance at 5 GHz.
9 - Transmission Enhancement by Antireflective Metasurface for Ground Penetrating Radar Applications Poster [Show abstract]
  • Wuan Zheng, Tongji University, China
  • Tong Hao, Tongji University, China
In this paper we present our simulation and experiment results of an antireflective metasurface for Ground Penetrating Radar applications. The metasurface consisting of Closed Ring Resonators (CRRs) shows a near perfect antireflection, and the transmission enhancement is only limited by material’s intrinsic losses. In addition, our design can achieve enhanced trans- mission over a large range of permittivities of the Material Under Test (MUT). By geometrical optimizations with the given material and physical properties, our CRR based design has been numerically demonstrated to be able to enhance the transmittance by 35% compared to the case where no such metasurface is in place.
10 - Random Checkerboard Metasurface for wideband RCS reduction Poster [Show abstract]
  • Shraddha Choudhary, Indian Institute of Technology Jodhpur, India
  • Kirankumar Hiremath, Indian Institute of Technology Jodhpur, India
<p> In this paper, a simple design strategy is proposed for obtaining a broadband, polarization insensitive metasurface, for radar cross section (RCS) reduction. Two different unit cells, circular patch and square ring structures are chosen as basic meta-atoms. For significant enhancement of RCS reduction bandwidth, sixteen supercells comprised from variation of the two unit cells are distributed randomly in a checkerboard setting, resulting in a diffused backward scattering. The proposed metasurface have a wide-band, polarization insensitive RCS reduction spectra.</p>
11 - The Design of the Dual-Frequency Multiplexing Holographic Impedance Metasurfaces Poster [Show abstract]
  • Yunbo Li, Southeast University, China
We propose a method to generate microwave holograms using impedance metasurfaces for two wavelengths. For recent impedance hologram designs in the microwave band, radiation from leaky waves can be controlled in the far field by creating holograms based on interference of reference and object waves at a specific frequency. In our design, we vary only one physical dimension in the unit cell to simultaneously satisfy the requirement of impedance distribution for two frequencies in the same aperture. Two excitation ports are used to simultaneously generate the beams at 17GHz and 20GHz.
12 - Changing Profile, Size And Position Simultaneously With Illusion Metasurface No show [Show abstract]
  • Zijie Jiang, Xi'an Jiaotong University, China
  • Qingxuan Liang, Xi'an Jiaotong University, China
  • Zhaohui Li, Xi'an Jiaotong University, China
  • Peiyao Lv, Xi'an Jiaotong University, China
  • Tianning Chen, Xi'an Jiaotong University, China
  • Dichen Li, Xi'an Jiaotong University, China
A triangular illusion metasurface which can restore the scattering field of a virtual object with different profile, size and position is proposed here. It is ultrathin, polarization independent and easy to fabricate. Foremost, such complex illusion is created by only one metasurface, which indicates a promising future of practical application.
13 - Software-Defined Metasurfaces: The VISORSURF Project Approach Poster [Show abstract]
  • Odysseas Tsilipakos, Foundation for Research and Technology Hellas, Greece
  • Alexandros Pitilakis, Foundation for Research and Technology Hellas, Greece
  • Anna Tasolamprou, Foundation for Research and Technology Hellas, Greece
  • Christos Liaskos, Foundation for Research and Technology Hellas, Greece
  • Ageliki Tsioliaridou, Foundation for Research and Technology Hellas, Greece
  • Fu Liu, Aalto University, Finland
  • Mohammad Sajjad Mirmoosa, Aalto University, Finland
  • Xuchen Wang, Aalto University, Finland
  • Kypros Kossifos, University of Cyprus, Cyprus
  • Julius Georgiou, University of Cyprus, Cyprus
  • Andreas Pitsillides, University of Cyprus, Cyprus
  • Nikolaos Kantartzis, Aristotle University of Thessaloniki, Greece
  • Dionysios Manessis, Fraunhofer IZM, Germany
  • Sotiris Ioannidis, Foundation for Research and Technology Hellas, Greece
  • George Kenanakis, Foundation for Research and Technology Hellas, Greece
  • George Deligeorgis, Foundation for Research and Technology Hellas, Greece
  • Eleftherios Economou, Foundation for Research and Technology Hellas, Greece
  • Costas Soukoulis, Foundation for Research and Technology Hellas & Ames Laboratory and Iowa State University, Greece & USA
  • Sergei Tretyakov, Aalto University, Finland
  • Maria Kafesaki, Foundation for Research and Technology Hellas, Greece
We present the approach of project VISORSURF towards software-defined metasurfaces. The “HyperSurface” is a locally tunable metasurface incorporating a nano-network of controllers. The proposed architecture consists of a tunable metasurface, an intra-tile communication layer and a gateway controller deploying and regulating intra-tile and external communications.
Media link(s):

See recent work: https://arxiv.org/abs/1811.10082, https://arxiv.org/abs/1712.01708, https://doi.org/10.1002/adom.201800633

14 - Miniaturization of Unit Cell of Self-oscillating Non-Foster Metasurface Poster [Show abstract]
  • Silvio Hrabar, University of Zagreb, Croatia
  • Katarina Cavar, University of Zagreb, Croatia
  • Marko Miksic, University of Zagreb, Croatia
  • Luka Tomic, University of Zagreb, Croatia
  • Leo Vincelj, University of Zagreb, Croatia
It is shown that the unit cell of self-oscillating non-Foster metasurface can be miniaturized by replacing original cross-dipole antenna with other radiators. The unit cell based on cross-dipole with capacitive loading spans sizes from λ/25 to λ/5 while the cell based on cross bow-tie spans sizes from λ/36 to λ/6, with the tuning ranges of 1:5 and 1:6, respectively.
15 - Simulation and Experimental Studies on Novel Cut-wire and LR based Metamaterial No show [Show abstract]
  • Subal Kar, SAMEER, Kolkata Centre, India
  • Amitesh Kumar, SAMEER, Kolkata Centre, India
  • Arijit Majumder, SAMEER, Kolkata Centre, India
  • Shantanu Das, BARC, India
<p> A novel 2D cut-wire (CW) and Labyrinth resonator (LR) based metamaterial has been designed and characterized with simulation and experiment. A wedge-shaped LR-CW media exhibited a negative refractive index of -1.34 and -1.28 respectively with simulation and experiment.</p>
16 - Thin Film Metamaterial Split Ring Resonators at Microwave Frequencies Poster [Show abstract]
  • Nees Paul, Christ College (Autonomous),Irinjalakuda, India
  • Sikha K.Simon, Christ College(Autonomous) Irinjalakuda, India
  • Bindu C., Christ College (Autonomous) Irinjalakuda , India
  • Jolly Andrews, Christ College (Autonomous) Irinjalakuda , India
  • Joseph V.P. , Christ College (Autonomous) Irinjalakuda , India
<p> In this paper we present a metamaterial Split Ring Resonator (SRR) made of thin films of nanometer thickness working in microwave frequencies. Since the thickness of nanofilm used for fabricating metamaterial structures is below the skin depth, unique resonance behaviour is observed in comparison to the resonance curves of its conventional counterpart made with thick films. At thickness less than skin depth, the film becomes resistive which inturn results in a wide band magnetic resonance. Silver thin film resonators of thickness 350 nm, 550 nm and 750 nm prepared on glass substrates using RF sputtering technique are used for the study. Absorption characteristics of the SRR and Broad Side Coupled SRR (BCSRR) are analyzed.</p>
17 - Metamaterial Split Ring Resonators made of Polyaniline - polytetrafluoroethylene at Microwave Frequencies Poster [Show abstract]
  • Nees Paul, St. Thomas College, University of Calicut, India
  • Joe Kizhakooden, St. Thomas College, University of Calicut, India
  • Jovia Jose, Vimala College, University of Calicut, India
  • Jolly Andrews, Christ College, University of Calicut, India
  • Joseph V P, Christ College, University of Calicut, India
We present the observance of magnetic resonance for the first time in Split Ring Resonators (SRRs) made of polyaniline based conducting polymer and verify our experimental result through simulation. The magnetic resonance behavior of Closed Ring Resonator (CRR) and SRR of polyaniline - polytetrafluoroethylene ( Pani - PTFE ) are presented. The humidity sensitive conducting Pani - PTFE ring behaves like low loss conducting ring with wide band magnetic resonance whereas the CRR doesnot show any resonant response as is expected. The results are analyzed using simulation studies for copper rings of similar dimensions. Magnetic resonance oberserved in Broad-side Coupled Split Ring Resonator ( BCSRR ) made of Pani - PTFE is also presented, highlighting its role in metamaterial based applications. Realization of metamaterial resonating structures using conducting polymers opens a new realm with immense possibilities in microwave and terahertz technologies.
18 - Specially Designed Metamaterial Split Ring Resonator for High Resolution Imaging at Microwave frequencies Poster [Show abstract]
  • Bindu C., University of Calicut, India
  • Sreedevi P. Chakyar, University of Calicut, India
  • Anju Sebastian, University of Calicut, India
  • Jolly Andrews, University of Calicut, India
  • Joseph V. P., University of Calicut, India
<p> A promising novel topology specially designed with the aim to reduce the effective size of the Split Ring Resonator (SRR) for sensitive and high resolution imaging applications is proposed. This is achieved by modifying the conventional SRR by slightly raising the split region of the outer ring structure perpendicular to the plane of SRR. The proposed design topology is such that the localized field at the projected portion of the structure is isolated from the remaining portion of the SRR. After identifying the needed projection height of the split region of this specially designed scanning probe, objects with dimensions very much less than operating wavelength is scanned and identified, which will not be possible by using a normal SRR. The experimental results are verified using high frequency stimulation software to authenticate the results of this newly designed sensor which may find applications in enhancing the sensitiveness of all types of SRR based sensors.</p>
19 - Rotation Sensor based on Near Field Perturbations of Metamaterial Split Ring Resonator Poster [Show abstract]
  • Anju Sebastian, Christ College (Autonomous), India
  • Sreedevi P. Chakyar, Christ College (Autonomous), India
  • Bindu C., Christ College (Autonomous), India
  • Joseph V. P., Christ College (Autonomous), India
  • Jolly Andrews, Christ College (Autonomous), India
<p> This paper uses the field distribution properties of metamaterial Split Ring Resonators (SRRs) for the implementation of a rotation sensor. The sensing principle is based on the shift in resonance frequency due to the change in effective capacitance of the SRR because of the perturbations in the field owing to the presence of the dielectric rotor.This sensor may find application for precise determination of shear related movements in various engineering and instrumentation problems.</p>
20 - A Wideband Transmission Frequency Selective Surface Rasorber With Low Insertion Loss Poster [Show abstract]
  • Jianfeng Wei, Huazhong University of Science and Technology, China
  • Wei Deng, Huazhong University of Science and Technology, China
  • Yun He, Huazhong University of Science and Technology, China
  • Zhipeng Lei, Huazhong University of Science and Technology, China
  • Yutong Liu, Huazhong University of Science and Technology, China
  • Yulu Zhang, Huazhong University of Science and Technology, China
  • Chengli Li, Huazhong University of Science and Technology, China
  • Jianjun Jiang, Huazhong University of Science and Technology, China
<p> A FSS rasorber for stealthy radome applications is presented and measured. By using a choked structure and a 2-order bandpass FSS, it has a wideband transmission with low insertion loss in C band and a strong absorption in X band. It will be widely used in stealthy antenna systems.</p>
21 - Wideband skewed grid frequency selective surface absorber for oblique incidence Poster [Show abstract]
  • Yulu Zhang, Huazhong University of Science and Technology, China
  • Jianjun Jiang, Huazhong University of Science and Technology, China
We present a wideband frequency selective surface (FSS) absorber for oblique incidence. The absorber structure with anisotropic elements exhibits different impedances in two polarizations to match free space characteristic impedance at oblique incidence, thus resulting in a low microwave reflectivity over a wideband range. The grating lobe is suppressed by the use of skewed grid. Simulation and measurement results all illustrate that the reflectivity covers a broad band of 1.35–4.0 GHz below -10 dB for both TE and TM polarizations at an incident angle of 45°.
22 - Gammadion Resonator Based Metamaterial Absorber Sensor in Application of Chemical Liquids Detection Poster [Show abstract]
  • Yadgar.I Abdulkarim, Central South University, China
  • Lianwen Deng, Central South University, China
  • Muharrem Karaaslan, Iskenderun Technical University, Turkey
  • Emin Unal, Iskenderun Technical University, Turkey
Metamaterial absorber based sensor design for determination chemical liquids (Benzene, acetone, Methanol, Ethyl alcohol and acetonitrile) was proposed in X- band. The structure consists of gammadion resonator made of copper on the top of dielectric spacer FR4, an air gap assigned between the copper plate and backside gammadion resonator to use as a reservoir of chemical liquids, CST (Computer Simulation Technology ) has been used to simulated structure, vector network analyzer 85070E probe kit is used to measure the dielectric properties of the selected chemical liquids, the results showed there is a significant absorption difference between each chemical which means the structure is very sensible for detecting the type of chemical liquids.
23 - Wide Band Microwave Absorber using Flexible Broadside Coupled Split Ring Resonator Metamaterial Structure Poster [Show abstract]
  • Umadevi K.S., Prajyothi Nikethan Pudukkad, India
  • Sikha K. Simon, Christ College(Autonomous) Irinjalakuda, India
  • Sreedevi P.Chakyar, Christ College(Autonomous) Irinjalakuda, India
  • JOLLY ANDREWS, Christ College(Autonomous) Irinjalakuda, India
  • Joseph V.P. , Christ College(Autonomous) Irinjalakuda, India
This paper proposes a wide band microwave absorber in a bulk form realized using a Broad Side Coupled Split Ring Resonator (BCSRR) metamaterial structural units fabricated in a novel way which possesses structural flexibility and wide band frequency tunability. Instead of using a conventional structure, the two conducting rings of the structure are prepared separately by photochemical etching using thin copper sheets glued on polypropylene film. The resonant property studies of the BCSRR show a noticeable tunability in resonant frequency with spacing variation, a result not observed using other conventional SRR structures. A spacing variation of 1 mm of a typical BCSRR unit shows around 3 GHz resonant tunability which makes it suitable for materializing various sensor applications. The resonant properties of BCSRR in a bulk form made with specific structural dimensions arranged in periodic manner with progressively varying spacing using layers of cotton fabric, show wide band resonant absorption. By suitably modifying the structural parameters of BCSRR rings, the range of the frequency absorption band can be specifically designed. The result of the study predicts a possibility of using this proposed BCSRR designs in various types of wide band absorbers.
24 - Ideal Absorption In Individual Dielectric Subwavelength Sized Scatterers Poster [Show abstract]
  • Claire GUIDET, Institut Fresnel, France
  • Redha ABDEDDAIM, Institut Fresnel, France
  • Brian STOUT, Institut Fresnel, France
  • Nicolas BONOD, Institut Fresnel, France
We present new analytical formulations for finding the permittivities that lead to ideal absorption in the magnetic dipolar and electric dipolar modes.
25 - A High-Power Wireless Charging System Based on Fano Resonance Poster [Show abstract]
  • Yu Liu, Tongji University, China
  • Yewen Zhang, Tongji University, China
  • Jun Jiang, Tongji University, China
  • Kai Fang, Tongji University, China
  • Kejia Zhu, Tongji University, China
  • Keqiang Lv, Tongji University, China
  • Yunhui Li, Tongji University, China
Wireless charging technology is mainly divided into magnetic induction and magnetic resonance, each of them has its inherent defects. So we study a three-coil wireless charging system based on Fano resonance, and predict that this system will get a further application in the scene of moving and charging.
26 - High Dielectric Ring Resonators No show [Show abstract]
  • Bahareh Moradi, Polytechnic University of Catalunia, Spain
  • Joan Gaecia, Autonoma university of Barcelona, Spain
<p> In this paper, the utilization of high dielectric constant resonator as a passive element for design of filter in the range of Ku band is investigated. The design is based on a new kind of dielectric resonator fabricated with a commercial high dielectric constant EPOXY paste. The design is based on a microstrip line periodically loaded with a new kind of dielectric resonator fabricated with a commercial high dielectric constant Epoxy paste compatible with serigraphy and screen printing technology.</p>
27 - Diplexer Based on Surface Plasmon Polariton-like Propagation Induced by Structural Dispersion of Substrate Integrated Waveguide Poster [Show abstract]
  • Mihailo Drljaca, Institute BioSense, Serbia
  • Zarko Sakotic, Institute BioSense, Serbia
  • Norbert Cselyuszka, Institute BioSense, Serbia
  • Vesna Crnojevic Bengin, institute BioSense, Serbia
  • Nikolina Jankovic, Institute BioSense, Serbia
In this paper we propose a novel diplexer based on surface plasmon polariton (SPP) like propagation in substrate integrated waveguide (SIW). The diplexer consists of two two-layer SIW filters, where layers are designed to have effective permittivities of opposite signs in a certain frequency ranges, thus providing SPP-like propagation, and consequently passbands and stopbands in the desired frequency ranges. The diplexer is designed to operate at 2.4/2.6 GHz, and it is characterized by high performance, low-profile and low-cost structure.
28 - Investigations of a Wideband Metamaterial-based Microstrip Meander Line with Slotted Screen Poster [Show abstract]
  • Andrey Yelizarov (Elizarov), Higher School of Economics, Moscow Institute of Electronics and Mathematics, Russia
  • Alexander Kukharenko, Science-Research University of Technical Physics and Automatisation, Moscow, Russia
  • Andrey Skuridin, Higher School of Economics, Moscow Institute of Electronics and Mathematics, Russia
A construction of an extra wideband frequency-selective surface, formed by a microstrip meander line with slotted screen is described. The measurements of the structure band gap, which covers L1, L2, L3 and L5 bands, are presented. The permittivity and permeability calculation results, which show that the parameters have negative values in the band gap, what proves that the proposed structure is a double negative metamaterial, are shown.
29 - Direct Amplitude Modulation Technique using Metamaterial Broadside Coupled Split Ring Resonator (BCSRR) Structure Poster [Show abstract]
  • Sikha K. Simon , Christ College(Autonomous) Irinjalakuda, India
  • Sreedevi P. Chakyar, Christ College(Autonomous) Irinjalakuda, India
  • Anju Sebastian, Christ College(Autonomous) Irinjalakuda, India
  • Jolly Andrews, Christ College(Autonomous) Irinjalakuda, India
  • Joseph V.P. , Christ College(Autonomous) Irinjalakuda, India
This paper introduces a novel Amplitude Modulation (AM) technique employing metamaterial Broadside Coupled Split Ring Resonator (BCSRR). The carrier wave in the range of GHz frequency is directly modulated by the signal, using a specially designed BCSRR acting as a modulation sensor. The Modulated signal is transmitted through air and receiving it from a distance, the original signal is faithfully reproduced. Resonant frequency dependence of the spacing between the two rings of the BCSRR is employed for the modulation process and it is achieved by varying the spacing between the rings in accordance with the input signal. For the effective modulation, the carrier frequency is chosen at the midpoint of the linear section of the falling/rising slope of the absorption curve of the BCSRR unit. By selecting the BCSRR with narrow bandwidth, effective modulation is obtained even for weak signals. The chances of distortions in the AM wave due to over modulation are also addressed. The distinct characteristics of this modulation process, which does not require any associated electronic components, over conventional AM process, along with its manifold possibilities in the field of communication and instrumentation are also discussed.
30 - Topological Robustness of Phase Singularities at Microwave Frequencies Poster [Show abstract]
  • Andrea Bassotti, Niccolò Cusano University, Italy
  • Mirko Barbuto, Niccolò Cusano University, Italy
  • Andrea Alù, City University of New York, USA
  • Filiberto Bilotti, Roma Tre University, Italy
  • Alessandro Toscano, Roma Tre University, Italy
<p> In this contribution, we investigate the self-healing properties of vortex modes at microwave frequencies. In particular, we show that the peculiar characteristics of vortex modes generated by patch antennas, i.e., the presence of a phase singularity point inherently related to an amplitude null, cannot be suppressed by a metallic object placed in the near-field of the antenna itself. This result could be exploited to design antenna systems with robust radiation characteristics respect to the presence of other objects placed in their close proximity.</p>
31 - High-efficiency Generation Of Bessel Beams With Transmissive Metasurfaces Poster [Show abstract]
  • Zhuo Wang, Fudan University, China
<p> Circularly polarized Bessel beams (BBs) are important in biomolecule-sensing-related applications, but available generators are too bulky in size and/or exhibit low efficiencies. Here we design and fabricate ultra-thin (λ/6) transmissive Pancharatnam-Berry metasurfaces, and perform near-field scanning measurements to show that they can generate circularly polarized BBs within a frequency window (10.7-12.3 GHz). We experimentally demonstrate that the generated BBs exhibit self-healing effect, illustrating their non-diffraction characteristics. Finally, we employ far-field measurements to demonstrate that the working efficiency of our devices can reach 91%, while the simulated efficiency reaches 92%. All experimental results are in perfect agreement with full wave simulations.</p>
32 - Generation of Bessel Bottle Beam Using Metasurfaces No show [Show abstract]
  • Long Li, Xidian University, China
  • Yongjie Liu, Xidian University, China
  • Hao Xue, Xidian University, China
  • Haixia Liu, Xidian University, China
  • Yan Shi, Xidian University, China
In this paper, a Bessel bottle beam is generated by metasurface. Firstly, the principle of the bottle beam is analyzed based on geometrical optics. And then, a Bessel bottle beam is generated with reflective metasurface at 10GHz. A metasurface is designed with the radius of 245mm, and the metasurface can be divided into the inner part and the outer part. With the plane wave incidence in HFSS, the Bessel bottle beam has been generated. Finally, the performance about the Bessel bottle beam is discussed.
33 - All-Dielectric Metasurfaces with Toroidal Mode Resonances at sub-THz Poster [Show abstract]
  • Jose Francisco Algorri, GDAF, Carlos III University of Madrid, Spain
  • Dimitris Zografopoulos, Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi (CNR-IMM), Italy
  • Antonio Ferraro, Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi (CNR-IMM), Italy
  • Pedro Martin-Mateos, Sensors and Instrumentation Techniques (SIT), Carlos III University of Madrid, Spain
  • Braulio Garcia-Camara, GDAF, Carlos III University of Madrid, Spain
  • Aldo Moreno-Oyervides, Sensors and Instrumentation Techniques (SIT), Carlos III University of Madrid, Spain
  • Viktor Krozer, Physics Institute, Goethe University , Germany
  • Pablo Acedo, Sensors and Instrumentation Techniques (SIT), Carlos III University of Madrid, Spain
  • Romeo Beccherelli, Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi (CNR-IMM), Italy
  • Jose Manuel Sanchez-Pena, GDAF, Carlos III University, Spain
  • Ricardo Vergaz, GDAF, Carlos III University of Madrid, Spain
A novel free-standing dielectric metasurface that shows a strong toroidal resonance in the sub-THz range is proposed and demonstrated. Theoretical and experimental studies confirm the basic operation principle and electromagnetic response of the metasurface. This first demonstration of a single-layer silicon metasurface opens new venues of research for the investigation of toroidal modes and the engineering of ultra-high Q factor devices in the sub-THz spectral range, where high Q factors are very difficult to obtain
34 - Self-Complementary Metasurfaces As Efficient Tools For Polarization Sensitive Control Of THz Beams Poster [Show abstract]
  • Andrey Sayanskiy, ITMO University, Russia
  • Vladimir Lenets, ITMO University, Russia
  • Sergei Kuznetsov, Rzhanov Institute of Semiconductor Physics SB RAS, Russia
  • Stanislav Glybovski, ITMO University, Russia
  • Juan Domingo Baena, Universidad Nacional de Colombia, Colombia
In this work we present the results of numerical simulation of the self-complementary metasurface which is illuminated by circular polarized plane wave provide an anomalous refraction of the cross-polarized beam. The metasurface create the cross-polarized beam in the desired transmission angle, while keeping the co-polarized beam transmitted in the broadside.
35 - Making Second-Order Optical Nonlinearity in Metallic Film Poster [Show abstract]
  • Teruya Ishihara, Tohoku University, Japan
  • Yusuf B. Habibullah, Tohoku University, Japan
  • Max Lein, Tohoku University, Japan
Second-harmonic generation (SHG) from Au thin film with a sub-wavelength asymmetric pattern is numerically investigated using the nonlinear scattering theory. In order to achieve a double resonance, a size of a square patch resonator for SHG frequency for x-polarization is optimized first. Then a cut along x-direction is introduced to break the inversion symmetry, of which length is tuned to obtain the fundamental resonance for y-direction. Due to the large overlap of fundamental and SHG fields at the edge of the structure, efficient SHG is expected.
36 - Optical Metasurface as a Wave Retarder and Tunable Partial Polarizer Poster [Show abstract]
  • Somendu Maurya, Aalto University, Finland
  • Markus Nyman, Aalto University, Finland
  • Andriy Shevchenko, Aalto University, Finland
  • Matti Kaivola, Aalto University, Finland
The tunability of functional metamaterials and metasurfaces can open up new possibilities in control of optical fields. We designed an ultrathin anisotropic metamaterial which acts as a quarter waveplate and a tunable partial polarizer. The designed waveplate has a low-loss and broadband operation. With slightly different dimensions, the same structure acts as a partial polarizer with tunability of the degree of polarization from 0 to 1. The devices are simple and easy to fabricate.
37 - Acousto-optical Light Modulation At 10.6 µm Using Multilayered Structures Poster [Show abstract]
  • Ivan Sopko, Lomonosov Moscow State University, Russia
  • Grigory Knyazev, Lomonosov Moscow State University, Russian Quantum Center, Russia
  • Daria Ignatyeva, Lomonosov Moscow State University, Russian Quantum Center, Russia
  • Daria Sylgacheva, Lomonosov Moscow State University, Russian Quantum Center, Russia
  • Vladimir Belotelov, Lomonosov Moscow State University, Russian Quantum Center, Russia
Mid-infrared range is of great interest due to atmosphere transparency window and possibility to generate high power radiation with high-efficiency emitters such as CO2 laser operating at 10.6 μm. We propose a mechanism to enhance the acousto-optical modulation efficiency at 10.6 μm wavelength utilizing multilayered structures. Several types of structures providing excitation of Fabry-Perot and plasmon-polariton modes, phonon-polariton modes and waveguiding modes are analyzed.
38 - Metamaterials on Helix Structures with Abnormal Dispersion Poster [Show abstract]
  • Andrey Yelizarov (Elizarov), Higher School of Economics, Moscow Institute of Electronics and Mathematics, Russia
  • Alexander Kukharenko, Science-Research University of Technical Physics and Automatisation, Moscow, Russia
  • Andrey Skuridin, Higher School of Economics, Moscow Institute of Electronics and Mathematics, Russia
  • Valentina Karavashkina, Moscow Technical University of Communications and Informatics, Russia
Reasons of appearance and possible ways of frequency dispersion control in metamaterials based on helix structures with the help of a longitudinal propagation ground plane and a ground plane with capacitive conductivity in azimuth direction are considered. It is shown that existence of metamaterial constructions based on helix systems with abnormal dispersion is a perspective way of reduction if devices longitudinal dimensions keeping the same time their electrodynamics characteristics and parameters. In the case with frequency rise up the wave phase speed also increases keeping the structure electrical length and the presence of slow-wave coefficient allows structure dimensions decreasing.
39 - Numerical Investigation of the Fano Resonance Based Complementary All-dielectric Metasurface No show [Show abstract]
  • Keshav Samrat Modi, AcSIR, CSIR-CSIO, Chandigarh Campus, Ghaziabad, India, India
  • Umesh Tiwari, Advanced Materials and sensors (Photonics V-4), CSIR-CSIO, Chandigarh, India, India
  • Ravindra Kumar Sinha, CSIR-CSIO, Chandigarh, India, India
<p> Put your The all−dielectric metasurface structures are very attractive in the optical wavelength regime due to the negligible loss. The all−dielectric metasurface with asymmetric structure produce Fano−resonance of high Q-factor which may be used in the biochemical sensing applications. The proposed sensor has high Figure-of-merit. In this paper, a complementary all−dielectric metasurface structure is numerically investigated by using two commercially available software packages COMSOL Multiphysics and CST Studio Suite.</p>
40 - Electromagnetic waves through metamaterial superlattices Poster [Show abstract]
  • Pedro Pereyra, Universidad Autonoma Metropolitana (Azcapotzalco), Departamento de Ciencias Básicas, Mexico
  • Fatna Assaoui, University Mohamed V, Department of Physics, Morocco
We present explicit results of the transmission coefficients and negative phase time in metamaterial superlattices (MMSL), containing alternating layers of left and right-handed materials. We discuss briefly the space-time evolution of Gaussian wave packets moving through We will explicitly show that the time spent by the Gaussian wave packet passing across the MMSL is correctly described by the phase time.
41 - Transverse Magneto-Optical Intensity Effect in Non-symmetric Plasmonic Nanostructures Poster [Show abstract]
  • Olga Borovkova, Russian Quantum center, Russia
  • Andrey Kalish, Russian Quantum center, Russia
  • Daria Ignatyeva, Russian Quantum center, Russia
  • A.A. Voronov, Russian Quantum center, Russia
  • Mikhail Kozhaev, Russian Quantum center, Russia
  • Hisham Hashim, National University of Science and Technology (MISIS), College of New Materials and Nanotechnology, Department of Technology of Electronics Materials, Russia
  • Sarkis Dagesyan, M.V. Lomonosov Moscow State University, Faculty of Physics, Russia
  • Alexander Shaposhnikov, Research Center for Functional Materials and Nanotechnologies, Institute of Physics and Technology, V.I. Vernadsky Crimean Federal University, Russia
  • Vladimir Berzhansky, Department of Experimental Physics, Institute of Physics and Technology, V.I. Vernadsky Crimean Federal University, Russia
  • Venu Gopal Achanta, Department of Condensed Matter Physics and Material Science, Tata Institute of Fundamental Research, India
  • Anatoly Zvezdin, Russian Quantum center, Russia
  • Larissa Panina, National University of Science and Technology (MISIS), College of New Materials and Nanotechnology, Department of Technology of Electronics Materials, Russia
  • Vladimir Belotelov, Russian Quantum center, Russia
<p> The emergence of the nonzero TMOKE in non-symmetric plasmonic nanostructures is reported. It was found that the effect grows with the increase of asymmetry. The physical origins of this effect are addressed.</p>
42 - Surface Plasmon-Polaritons On The Boundary Vacuum-Metamaterial No show [Show abstract]
  • Olga Ivannikova, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Russia
  • Alexey Tishchenko, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Russia
  • Michael Strikhanov, National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Russia
In present work we focus on electromagnetic surface waves on the boundary vacuum-metamaterial. Based on the local field theory and taking into account the variation of the polarization in a thin near-surface layer we have obtained dispersion relation for TE-waves on the boundary vacuum-metamaterial. We have presented theoretical model for investigation of boundary of different metamaterial structures.
43 - Inversion of the Dark and Bright Modes of a Nanoparticle Dimer No show [Show abstract]
  • Thomas Sturges, University of Warsaw, Institute of Theoretical Physics, Poland
  • Charles Downing, Departamento de Física de la Materia Condensada, Universidad de Zaragoza, Spain
We analytically study the spectrum and plasmonic eigenstates of a nanoparticle dimer embedded inside a photonic cavity. We show a switching of the upper and lower modes from optically dark to bright, by tuning the light-matter coupling via the cavity height.
44 - The Accurate Mathematic Model Based on 2x2-Matrix For Anisotropic Photonic Crystals with Metamaterial Layers Poster [Show abstract]
  • Konstantin Vytovtov, Astrakhan State Technical University, Russia
  • Elizaveta Barabanova, Astrakhan State Technical University, Russia
  • Vladimir Vishnevskiy, V.A.Trapeznikov Institute of Control Sciences of RAN, Russia
The mathematic model of wave behavior within photonic crystal with anisotropic metamaterial layers based on 2x2 translation matrix is presented for the first time. The numerical calculations and result comparison with well-known 4x4 matrix methods are given also. It is proved also that the layer change theorem is valid for an anisotropic photonic crystal.
Media link(s):

The presented model is principle new in scope of a linear problem for anisotropic metamaterials, and biisotropic and bianisotropic materials. And the one allows us to solve the problems that are unsolvable by other methods.


The accurate analytical proofs of all expressions and theorems will be also presented in report.

The possible practical applications of the obtained resultes will be given too. For example, we will show the calculation of elements of photonic switching systems and photonic computers in scope of a linear problem.

45 - Blue-shift in hyperbolic metamaterials structure based on Al/HfO2 Poster [Show abstract]
  • Karol Sielezin, Military University of Technology, Poland
  • Alessandro Pianelli , Military University of Technology, Poland
  • Michal Dudek, Military University of Technology, Poland
  • Rafal Kowerdziej, Military University of Technology, Poland
  • Marek Olifierczuk, Military University of Technology, Poland
  • Janusz Parka, Military University of Technology, Poland
<p> Hyperbolic metamaterial based on Al/HFO2 is designed and numerically investigated at the Near and Mid-IR frequencies. Numerical results show, that by using different configuration structures as well as by modifying the fill fraction, a narrow-band blueshift of reflectance can be observed. Modelled hyperbolic metamaterial can be employed as a tunable frequency selective surfaces</p>
46 - Wide Band Polarization Converter Graphene Metasurface for Mid-Infrared Band Poster [Show abstract]
  • Mahmoud Abdalla, Military Technical College, Egypt
  • Ahmed Abdel Aziz , Military Technical College, Electronic Engineering Department, Cairo, Egypt
  • Ahmed Ibrahim, Minia University, Electronic Engineering Department, Minia, Egypt
Monolayer Graphene-based metasurface is introduced in this work. A high Polarization Conversion Ratio (PCR) is verified in Mid-Infrared band by using a graphene as an upper conductor for metasurface. The metasurface construction is composed of a single layer of graphene, which has a half ring slots with rectangular slot connecting between them. The whole shape is rotated with 45º. Silicon dioxide substrate is used with a metal backed ground. The simulation results of the proposed metasurface indicate that a linearly polarized incident wave is converted to a circular polarized one over more than one THz along the Mid-Infrared frequency band. PCR has a maximum value of approximately 98% at 1.45 THz. The polarization conversion ratio is studied for different angles of incidence, with stable value for a wide range of incident angles. The commercial engineering software solver (CST Studio Suite) is used to define the graphene layer and study the different cases of the metasurface.
47 - Ellipsometric Study of Ferritin Clusters Adsorbed on Metasurface and Influenced by UV Irradiation Poster [Show abstract]
  • Maya Tanovska, Sofia University "St. Kliment Ohridski" Faculty of Physics, Bulgaria
  • Mohsen Rahmani, The Australian National University, Nonlinear Physics Centre, Australia
  • Nikolay Zografov, Sofia University "St. Kliment Ohridski" Faculty of Physics, Bulgaria
  • Lilia Vladimirova-Mihaleva , Sofia University "St. Kliment Ohridski" Faculty of Physics, Bulgaria
  • Dragomir Neshev, The Australian National University, Nonlinear Physics Centre, Australia
An amorphous silicon arrays of resonant nanostructures were used as a substrate for Ferritin protein adsorption. The properties of the Ferritin clusters, adsorbed on a dielectric metasurface, was studied ellipsometrically as a function of UV irradiation. Our results show that the properties of the Ferritin clusters depends on the UV exposure time. The data show that the metasurface are applicable for analysis and characterization of biomolecules by ellipsometry.
48 - Enhancement Of Magnetooptical Effects In Nanostructured Iron-Garnet Meta-Surface Poster [Show abstract]
  • Andrey Voronov, M.V.Lomonosov Moscow State University, Faculty of Physics, Russia
  • Daria Ignatyeva, Russian Quantum Center, Russia
  • Dolendra Karki, Michigan Technological University, USA
  • Mikhail Kozhaev, Prokhorov General Physics Institute of the Russian Academy of Sciences, Russia
  • Miguel Levy, Michigan Technological University, USA
  • Vladimir Belotelov, Russian Quantum Center, Russia
We propose a novel iron-garnet meta-surface structure that increases magnetooptical effects in it due to excitation of optical surface modes. Magnetic meta-surface is fabricated as magnetophotonic crystals with 1D periodicity achieved by etching of 300-nm thick bismuth-substituted iron-garnet film. We study experimentally the multifold increase of the linear magnetooptical response caused by the excitation of various types of optical modes.
49 - Highly sensitive magnetometry method based on the magnetoplasmonic crystal Poster [Show abstract]
  • Grigory Knyazev, Lomonosov Moscow State University, Russian Quantum Center, Russia
  • Daria Sylgacheva, Lomonosov Moscow State University, Russian Quantum Center, Russia
  • Pavel Kapralov, Russian Quantum Center, Russia
  • Nikolay Gusev, Russian Quantum Center, Russia
  • Andrey Kalish, Lomonosov Moscow State University, Russian Quantum Center, Russia
  • Petr Vetoshko, Russian Quantum Center, Russia
  • Sarkis Dagesyan, Lomonosov Moscow State University, Russia
  • Alexander Shaposhnikov, Russian Quantum Center, Russia
  • Vladimir Berzhansky, Russian Quantum Center, Russia
  • Anatoly Zvezdin, Russian Quantum Center, Russia
  • Vladimir Belotelov, Lomonosov Moscow State University, Russian Quantum Center, Russia
A novel concept of the room-temperature magnetoplasmonic magnetic field sensor with high sensitivity and spatial resolution is presented. Geometrical parameters of the magnetoplasmonic crystals are adjusted to have pronounced resonances of the longitudinal magneto-photonic intensity effect (LMPIE).
50 - Cavity Enhanced Transverse Magneto-optical Kerr Effect of Al\AAO Based Nanostructure Arrays Poster [Show abstract]
  • Weiwei Zhang, Center for Modern Physics Technology, University of Science and Technology, Applied Physics Department, School of Mathematics and Physics, China
  • Daria Sylgacheva, Lomonosov Moscow State University, Russian Quantum Center, Russia
  • Pavel Kapralov, Russian Quantum Center, Russia
  • Vladimir Belotelov, Lomonosov Moscow State University, Russian Quantum Center, Russia
In this work, reflectance and transverse magneto-optical Kerr effects (TMOKE) were investigated in Py (permalloy) and Py\Ta nanostructures deposited on the anodic aluminum oxide (AAO) template based on aluminum substrate (Al\AAO) via a magnetron sputtering method. It is demonstrated that the increase of TMOKE near reflectance minimum can be tuned by the AAO membrane diameter, and the TMOKE intensity can be enhanced once the Ta layer was introduced, elucidated by influence of high spin-orbit coupling in Ta on TMOKE. This proposed nanostructure conveys a new pathway in the design of advanced magneto-optical devices for optoelectronic and magneto-optical applications.
51 - Theoretical study of a high-permittivity dielectric ring resonator for Magnetic Resonance Microscopy applications Poster [Show abstract]
  • Marine A.C. Moussu, Aix Marseille University, France
  • Stanislav Glybovski, ITMO University, Russia
  • Luisa Ciobanu, CEA Neurospin, France
  • Ivan Voznyuk, Multiwave Innovation, France
  • Redha Abdeddaim, Aix Marseille University, France
  • Stefan Enoch, Aix Marseille University, France
A novel type of probe for Magnetic Resonance Microscopy, based on high-permittivity and low-loss ceramic ring resonators, is investigated from a theoretical point of view. An analytical study of the first Transverse Electric eigenmode of such resonator is provided to confirm the relevance of the corresponding magnetic field distribution in terms of SNR.
52 - Controlling emission close to surfaces Poster [Show abstract]
  • Dean Patient, University of Exeter, United Kingdom
  • Simon Horsley, University of Exeter, United Kingdom
The emission rate from an antenna depends on its environment. Close to a surface, emission rates can be drastically modified. Metamaterials can be engineered to alter these emission rates. Here we give some theoretical techniques for designing graded material profiles that modify the rate of emission close to an interface.
53 - Topological Tuning of a Dispersion Curve by Controlling Locations of Impurities with Equivalent Circuit Model Poster [Show abstract]
  • Akira Hasegawa, Kyoto University, Department of Electrical Engineering, Japan
  • Takashi Hisakado, Kyoto University, Department of Electrical Engineering, Japan
  • AKMMahfuzul Islam, Kyoto University, Department of Electrical Engineering, Japan
  • Osami Wada, Kyoto University, Department of Electrical Engineering, Japan
We describe topological tuning of dispersion curves by controlling locations of doped impurities in a periodic lattice. We derive an equivalent circuit model for structures of wired metallic spheres and topologically estimate the resonant frequencies. With the topological perturbation, we propose an algorithm to determine the impurities' locations automatically.
54 - Numerical Method to Study Three-Dimensional Metamaterial Composites Poster [Show abstract]
  • Takamichi Terao, Gifu university, Japan
A generalized plane-wave expansion (G-PWE) method was developed to solve Maxwell’s equations for the propagation of electromagnetic waves. This method is applicable to dispersive materials with arbitrary frequency-dependent permittivity and permeability, where such features are requisite to investigate the electromagnetic wave propagation in metamaterials and their composites.
55 - Enhancement of Weak Nonlocality in Aperiodically Ordered Multilayered Dielectric Metamaterials Poster [Show abstract]
  • Marino Coppolaro, University of Sannio, Italy
  • Giuseppe Castaldi, University of Sannio, Italy
  • Vincenzo Galdi, University of Sannio, Italy
In certain critical parameter regimes, dielectric multilayered metamaterials made of deeply subwavelength layers may exhibit enhanced nonlocal effects, manifested as significant differences between the exact optical response of finite-size metamaterial samples and the effective-medium-theory prediction. Here, we extend these observations (insofar available for periodic and random geometries) to aperiodically ordered scenarios.
56 - Some Ideas for Non-Hermitian Doping of Epsilon-Near-Zero Media Poster [Show abstract]
  • Marino Coppolaro, University of Sannio, Italy
  • Massimo Moccia, University of Sannio, Italy
  • Nader Engheta, University of Pennsylvania, USA
  • Vincenzo Galdi, University of Sannio, Italy
We extend the recently introduced concept of photonic doping of epsilon-near-zero media to non-Hermitian scenarios featuring mixtures of gain and loss in dopants. In particular, we show that cylindrical core-shell inclusions can exhibit resonant phenomena that enable the tailoring of the effective permeability over broad regions of the complex plane.
57 - Parametric resonances in time-varying (“photonic Floquet”) media No show [Show abstract]
  • Peter Halevi, INAOE, Mexico
  • Juan Sabino Martínez Romero, INAOE, México
A slab whose permittivity and/or permeability is modulated periodically in time, the transmitted fields become resonant for wave frequencies that are 1/2, or 3/2, etc of the modulation frequency - provided that a certain parameter (proportional to the slab thickness) assumes a "resonant value".
58 - Surface Waves Propagation on the Interface Between the High-Permittivity Dissipative Dielectric Layer and the Double-Negative Metamaterial with Gain No show [Show abstract]
  • Viktor Galaydych, V. N. Karazin Kharkiv National University, Ukraine
  • Mykola Azarenkov, V. N. Karazin Kharkiv National University, Ukraine
  • Volodymyr Olefir, V. N. Karazin Kharkiv National University, Ukraine
  • Oleksandr Sporov, V. N. Karazin Kharkiv National University, Ukraine
The properties of surface electromagnetic waves propagating along a planar structure consisting of a conventional dielectric, a dielectric layer with large losses and a high dielectric constant and a double negative metamaterial (DNM) with "amplification" are studied. Dispersion relations for the eigenmodes of such a waveguide structure are obtained. The possibility of full compensation of the energy losses of surface waves is demonstrated.
59 - Plane Wave Diffraction by PEC – DNG Metamaterial Junctions in Non-Planar Arrangements Poster [Show abstract]
  • Giovanni Riccio, University of Salerno, Italy
  • Gianluca Gennarelli, I.R.E.A. - C.N.R., Italy
A high-frequency solution is presented to evaluate the diffraction contribution by the edge of a non-planar junction that consists of a metal layer and a lossy double negative metamaterial sheet. The diffraction problem is solved in the case of skew incidence by means of an analytical method that is based on the physical optics approximation and provides closed form expressions in the framework of the uniform theory of diffraction. The evaluation of the diffraction coefficients is stress-free since they contain standard parameters and functions.
60 - Controlling Energy Spectra and Whispering Gallery Modes of Electrons in a Few Electrons Lateral Quantum Dot No show [Show abstract]
  • Shahab Ramezanpour, Saint Petersburg State University of Information Technologies, Mechanics and Optics, Russia
  • Alexander Mintairov, University of Notre Dame, USA
  • Andrey Bogdanov, Saint Petersburg State University of Information Technologies, Mechanics and Optics, Russia
This paper shows that Whispering Gallery Modes (WGMs) can exist between two lowest energy levels of a quantum dot (QD), s- and p-states by taking into account the Coulomb interaction between the electrons, since Coulomb interaction plays a crucial role in these dots. In literature, lateral QDs are usually modeled by a 2D harmonic oscillator. However, our calculations reveal that some degenerate energy levels would be created due to the height of the QD. The effect of QD's size, and magnetic field on the energy spectra are also investigated.
61 - Tensile and Compressive Properties of 3D Printed Schlegel Perspective Uniform-4-polytope Based Mechanical Metamaterials No show [Show abstract]
  • Gabrielis Cerniauskas, The University of Edinburgh, United Kingdom
  • Parvez Alam, The University of Edinburgh, United Kingdom
This paper presents the results of a series of compressive and tensile tests conducted on 3D printed lightweight mechanical metamaterials based on 3D Schlegel perspectives of uniform-4-polytopes. Our 3D printed structures reveal unconventional properties that have a range of potential applications, where ordinary materials would not suffice.
62 - Study about Shape Conversion for Resonant Tunneling Method for Subwavelength Imaging No show [Show abstract]
  • Md Anzan-uz-Zaman, University of Science and Technology, Korea (South)
  • Kyungjun Song, Korea Institute of Machinery and Materials, Korea (South)
  • Shin Hur, Korea Institute of Machinery and Materials, Korea (South)
<p> Resonant tunneling method for subwavelength imaging has prospective application in near field cases. But due to diameter modulation factor the fabrication of such kind of lens is more complex than Fabry-Pérot (FP) resonance based lens. As primarily the theory of resonant tunneling lens is based on cylindrical hole, we extended it for square shaped parallelepiped hole. Therefore, at this work we have mainly proposed a way for shape conversion which might be used as a handy tool regarding fabrication perspectivePut your abstract here.</p>
63 - Numerical Study of Acoustic Metamaterial Composites in Higher Dimension Poster [Show abstract]
  • Takamichi Terao, Gifu university, Japan
Vibrational properties of elastic composites containing a mass-in-mass microstructure embedded in a solid matrix are numerically studied. The vibrational density of states is investigated in three-dimensional composite structures where resonant particles are randomly dispersed. Multiple sonic band gaps can be also realized using different species of resonant particles.
64 - A semi-analytical method for acoustic phononic crystals by weak formulation Poster [Show abstract]
  • Dongwoo Lee, Pohang University of Science and Technology, Korea (South)
  • Minkyung Kim, Pohang University of Science and Technology, Korea (South)
  • Junsuk Rho, Pohang University of Science and Technology, Korea (South)
A weak formulation method is presented to analyze the propagation of acoustic waves in periodic crystal-like systems called phononic crystals. First, a compact circle and double split ring resonators with high impedance contrast to air background are employed to compute band structures with not only real parts of wavevectors but also imaginary parts of them. Calculating the imaginary part, which directly predicts a propagation length in band gaps, is not readily available in previous studies. It analytically enables us to more understand the behavior of evanescent mode in band gaps. Moreover, we present that the weak formulation method is advantageous in calculating equi-frequency contour.
65 - A Study On Beam Splitting In An Underwater Phononic Crystal With Dirac-like Point Poster [Show abstract]
  • Wonjae Choi, Korea Research Institute of Standards and Science (KRISS), Korea (South)
  • Jaeyub Hyun, Korea Research Institute of Standards and Science (KRISS), Korea (South)
Phononic crystals with Dirac-like point can have double-zero-index characteristics. We found that the phononic crystal can also have a different characteristics such as beam-splitting behavior. In this presentation, we introduce the phononic crystal with Dirac-like point and investigate its beam-splitting phenomenon.
66 - An Acoustic Frequency Selective Curtain Composed of Thicker and Thinner Membranes and Periodically Connected Elastic Pillars Poster [Show abstract]
  • Yasushi Horii, Kansai University, Japan
  • Wenjia Hong, Kansai University, Japan
  • Airi Tamaki, Kansai University, Japan
  • Toshiaki Kitamura, Kansai University, Japan
This paper proposes an acoustic frequency selective curtain composed of two membranes and periodically connected elastic pillars. This new architecture generates a pass band at a certain frequency, and can be used as a curtain which allows only a specific sound pass through.
67 - Gravitationally-Small Gravitational Antennas, the Chu Limit, and Exploration of Veselago-Inspired Notions of Gravitational Metamaterials Poster [Show abstract]
  • Thomas Weldon, University of North Carolina at Charlotte, USA
  • Kathryn Smith, University of North Carolina at Charlotte, USA
Recent results provide an analytic expression for the quality factor, or Q, of gravitationally-small gravitational quadrupoles, similar to the electromagnetic Chu limit. Notions of gravitational Q and gravitationally-small elements may lead to gravitational metamaterials. We explore inspiration from electromagnetic metamaterial frameworks where unit cells may be considered as electrically-small antennas.
68 - Energy Gaps And Conservation Of Transmittance Plus Slippage In Poynting Flow And Its Orbital And Spin Parts In The Presence Of Metal-Like Losses No show [Show abstract]
  • Hyoung In Lee, Seoul National University (Research Institute of Mathematics), Korea, Korea (South)
We examined the wave characteristics of the surface plasmon polaritons (SPPs), where the surface waves propagate along a planar interface lying between a lossless dielectric medium and a lossy metal. For time harmonic transverse magnetic (TM) fields, we investigated the Poynting vector and its orbital and spin parts by solving the Maxwell’s equations. By this way, we came up with the per-Poynting-vector orbital and spin parts, which are respectively two-dimensional vectors in the presence of metallic losses. As the first main finding, the resulting components of the per-Poynting-vector spin part exhibits bandgaps on the pseudo-total-angular momentum levels. In addition, we constructed the transmittance ratio across the material interface and the slippage ratio along the material interface. As the second main finding, we thus found a surprising numerical result that the sum of the transmittance and slippage ratios remain the same (albeit frequency-dependent) respectively for the Poynting vector and its two parts. These findings are relevant to the light-matter interactions and metamaterials, while being repeatable for the surface phonon polaritons (SPhPs) for silicon carbide.
69 - Adjoint-based Topology Optimization Applied to Inverse Design of Nanophotonic Materials Poster [Show abstract]
  • Yannick Augenstein, Karlsruhe Institute of Technology, Germany
  • Carsten Rockstuhl, Karlsruhe Institute of Technology, Germany
Inverse design involves the development of computational tools that can automate the design of nanophotonic devices for use in a wide range of applications. This is made possible by the adjoint method, which enables the calculation of design sensitivities for problems with a large number of degrees of freedom using only two full-field simulations. Here, we outline a general scheme for topology optimization utilizing the adjoint method for efficient gradient computation and apply it to two distinct inverse design problems, showcasing the non-intuitive nature of topology-optimized structures as well as the generality of the approach.
70 - Enhanced Magneto-Optic Response of the Ultrathin Iron-Garnet Films Poster [Show abstract]
  • Olga Borovkova, Russian Quantum Center, Russia
  • Miguel Levy, Michigan Technological University, USA
  • A.A. Voronov, Russian Quantum Center, Russia
  • Mikhail Kozhaev, Russian Quantum Center, Russia
  • Ashim Chakravarty, Radboud University, The Netherlands
  • Hisham Hashim, National University of Science and Technology (MISIS), Russia
  • Brandon Blasiola, Michigan Technological University, USA
  • Dolendra Karki, Michigan Technological University, USA
  • Colin Sheidler, Michigan Technological University, USA
  • François Jomard, Université Paris-Saclay, France
  • S.A. Dagesyan, Moscow State University, Russia
  • Elena Popova, Université Paris-Saclay, France
  • Niels Keller, Université Paris-Saclay, France
  • Vladimir Belotelov, Russian Quantum Center, Russia
<p> We report the enhancement of the magneto-optic response of ultrathin ferromagnetic films with a thickness of few dozen nanometers with respect to the magnetic properties of the corresponding bulk material. This effect has been explored by two different techniques, namely, by measurement of the transverse magneto-optical Kerr effect and by study of Faraday rotation in the ultrathin ferromagnetic films.</p>
16:00 - 17:30 - Oral sessions (Wednesday - afternoon 2)
16:00 - Special session on topological band gaps in metamaterials (part 4)

Session chairperson(s): Massimo Ruzzene

16:00 - 16:30 - Bound States, Reflection and Topology Invited oral [Show abstract]
  • Simon Horsley, University of Exeter, United Kingdom
I shall discuss new applications of topology to the design of electromagnetic materials, showing that the Atiyah–Singer index theorem determines the existence of modes in inhomogeneous media via material properties at the edge of the device.
16:30 - 16:45 - Enhanced Transmission in Non-Hermitian One-Dimensional Photonic Crystals Under Topological Phase Transition Oral [Show abstract]
  • Vladimir Novikov, M. V. Lomonosov Moscow State University, Russia
  • Tatiana Murzina, M. V. Lomonosov Moscow State University, Russia
<p> We study the light transmission through absorbing one-dimensional photonic crystals at the Laue diffraction scheme. The considered structure is designed to demonstrate topological phase transition associated with the changing of the symmetry of the eigenstates of electromagnetic modes. We showed that photonic crystal demonstrates enhanced transmission and pronounced features of frequency-angle transmission spectrum associated with topological phase transition.</p>
16:45 - 17:00 - Experimental Realization of Topologically Protected Photonic Modes in Composite Quantum Hall/Quantum Spin Hall Waveguides Oral [Show abstract]
  • Shukai Ma, University of Maryland, USA
  • Steven Anlage, University of Maryland, USA
Experimental demonstration of bianisotropic meta-waveguides consisting of quantum spin Hall and quantum Hall interfaces supporting backscatter-free and uni-directional electromagnetic modes.
Media link(s):

See arXiv preprint (https://arxiv.org/abs/1903.04109)

17:00 - 17:15 - Constructing symmetry-protected valley-Hall networks in photonic and phononic systems Oral [Show abstract]
  • Mehul Makwana, Imperial College London, United Kingdom
  • Richard Craster, Imperial College London, United Kingdom
  • Sebastien Guenneau, CNRS, France
  • Kun Tang, Bar-Ilan University, Israel
  • Patrick Sebbah, Bar-Ilan University, Israel
  • Gregory Chaplain, Imperial College London, United Kingdom
Predictive theory to geometrically engineer materials in continuum systems to have desired symmetry-induced effects is developed here by bridging the gap between quantum and continuum descriptions. We emphasise a predictive approach, the strength of which is demonstrated by the ability to design well-defined broadband edge states and valley-Hall networks. The design of these valley-Hall networks are contingent upon properties specific to the underlying geometries chosen. To achieve complete control over the flow of light, power division and redirection devices are required, of which beam-splitters are those most commonly utilised. We hope that the additional degrees of freedom afforded by our designs, in addition to the topological robustness of the modes, will result in its assimilation into practical devices.
17:15 - 17:30 - Violation of The Bulk-Surface Correspondence Principle in Topological Photonics No show [Show abstract]
  • Vasily Klimov, Lebedev Physical Institute, Russia
We have derived exact analytical description of waveguide made of chiral hyperbolic metamaterial. It allows us to investigate topologically protected surface states in details and to demonstrate violation of bulk-surface correspondence principle in topological photonics.
16:00 - Non-reciprocal metamaterials (part 1)

Session chairperson(s): Kosmas Tsakmakidis

16:00 - 16:15 - Breaking Time-Reversal Symmetry Within Infinitesimal Dimensions Through Staggered Switched Networks Oral [Show abstract]
  • Negar Reiskarimian, Columbia University, Massachusetts Institute of Technology, USA
  • Mykhailo Tymchenko, University of Texas at Austin, USA
  • Andrea Alu, University of Texas at Austin, City University of New York, USA
  • Harish Krishnaswamy, Columbia University, USA
Here we report on our recent results on breaking time-reversal symmetry in infinitesimal dimensions by exploiting spatio-temporal modulation in staggered switched networks. We demonstrate nonreciprocal components such as isolators that can be built exclusively based on switched capacitor networks which exhibit a quasi-electrostatic wave propagation mode with extremely slow wave velocity when operated in a previously unexplored regime between the traditional ”sampling” and ”filtering” regimes. An extremely compact ”inductor-less” isolator with an overall size of $\lambda$/3600x$\lambda$/1600 has been built in a 65nm CMOS IC fabrication process and provides <2 dB loss and up to 30 dB isolation.
16:15 - 16:30 - Non-reciprocal Metasurfaces Using Magnetochiral Effects At Optical Frequencies Oral [Show abstract]
  • Satoshi Tomita, Tohoku University, Japan
  • Nobutaka Ohnishi, NAIST, Japan
  • Hiroyuki Kurosawa, NICT, Japan
  • Hisao Yanagi, NAIST, Japan
We numerically study non-reciprocal light transmission through magnetochiral metasurfaces. The metasurfaces consisting of planar plasmonic gammadion nanostructures on a magnetic garnet film gives rise to the directional birefringence, referred to as the magnetochiral effect. The present study opens a door to a non-reciprocal polarization-independent one-way mirror in visible and near-infrared regions.
16:30 - 16:45 - Plasmonic Thouless Pump Oral [Show abstract]
  • Zlata Cherpakova, Universität Bonn, Germany
  • Stefan Linden, Universität Bonn, Germany
We report on the observation of quantized transport of SPPs in a Thouless pump consisting of periodically modulated plasmonic waveguides. The samples are fabricated by negative-tone gray-scale electron beam lithography. The SPP intensity evolution in real and Fourier space is recorded by leakage radiation microscopy.
16:45 - 17:00 - Angle-Independent Nongyrotropic Metasurfaces Oral [Show abstract]
  • Guillaume Lavigne, Polytechnique Montreal, Canada
  • Christophe Caloz, Polytechnique Montreal, Canada
We derive a general condition for angle-independent bianisotropic nongyrotropic metasurfaces and present two applications corresponding to particular cases: an angle-independent absorber/amplifier and an angle-independent spatial gyrator.
17:00 - 17:30 - Hidden Time-Reversal Symmetry in Optical Systems Invited oral [Show abstract]
  • Mario Silveirinha, University of Lisbon, Portugal
The reciprocity of dissipative systems is typically justified by the microscopic reversibility of physical processes. Here, I show that it is unnecessary to invoke microscopic arguments to establish a direct relation between “macroscopic” reciprocity and time-reversal invariance. Furthermore, I will discuss novel mechanisms that lead to a hidden time-reversal symmetry in optical systems.
16:00 - Optical metamaterials (part 2)

Session chairperson(s): Andrei Lavrinenko

16:00 - 16:15 - Novel Avenues for Optical Antennas Oral [Show abstract]
  • Hongyue Wang, Univ. Paris-Sud, France
  • Abdelhanin Aassime, CNRS and Univ. Paris-Sud, France
  • Xavier Le Roux, CNRS and Univ. Paris-Sud, France
  • Nick J. Schilder, Institut d'Optique Graduate School, CNRS and Univ. Paris-Saclay, France
  • Jean-Jacques Greffet, Institut d'Optique Graduate School, CNRS and Univ. Paris-Saclay, France
  • Aloyse Degiron, CNRS and Univ. Paris-Diderot, France
Optical antennas have become ubiquitous tools to enhance the spontaneous emission of atoms, molecules and quantum dots. The designs rules that have been established over the years are based on the understanding that optical antennas operate through the Purcell effect. We show that this paradigm fails for ensembles of interacting emitters and that a statistical framework is required to understand their interactions with optical antennas. We illustrate these findings with assemblies of PbS nanocrystals in direct contact with arrays of metal nanoparticles and show that these structures have an interesting potential as optoelectronic metamaterials.
16:15 - 16:30 - Resonant Transmittance of Asymmetric Array of Optical Cavities Oral [Show abstract]
  • Rodion Kononchuk, University of Texas at San Antonio, USA
  • Ilya Vitebskiy, Air Force Research Laboratory, USA
  • Andrey Chabanov, University of Texas at San Antonio, USA
Resonant transmittance of an asymmetric pair of optical cavities with accidental spectral degeneracy can be strongly suppressed, within broad frequency range, by a small nonlinearity or a small change in the direction of incidence.
16:30 - 17:00 - Ballistic Metamaterials Extended oral [Show abstract]
  • Evgeniy Narimanov, Purdue University, USA
Ballistic metamaterials, metal-dielectric composites with the unit cell size smaller than electron mean free path, represent a new class of composite media with many unique properties, such as hyperbolic response above the plasma frequency.
17:00 - 17:15 - Optical Second Harmonic Generation in Cobalt Nanolayers Influenced by Nonmagnetic Heavy Metals Oral [Show abstract]
  • Tatiana Murzina, Moscow State University, Russia
<p> Optical second harmonic generation (SHG) is used to study magnetic properties of planar nanostructures based on ferromagnetic and heavy metals. Based on the SHG magnetic field dependencies, we show clear differences in the magnetic behavior of the interfaces and of bulky materials attributed in part to interfacial chiral magnetization.</p>
17:15 - 17:30 - Polarizing Beamsplitter Grating based on Asymmetric Slot Waveguide Scatterers Oral [Show abstract]
  • Ashutosh Patri, Polytechnique Montreal, Canada
  • Stephane Kena-Cohen, Polytechnique Montreal, Canada
  • Christophe Caloz, Polytechnique Montreal, Canada
We demonstrate a novel design for grating-based polarizing beamsplitters. The structure has a subwavelength thickness and is engineered to suppress all diffraction orders except for those of the desired orthogonal polarizations. This is achieved by using an asymmetric slot waveguide scatterer unit cell to ensure polarization-selective directional scattering.
17:30 - 19:00 - Break before Gala Dinner
19:00 - 22:00 - Gala dinner
19 September 2019 / Start time: 9 h 0 min
09:00 - 10:00 - Plenary session IV
09:00 - Plenary session IV

Session chairperson(s): Martin Wegener

09:00 - 10:00 - Nonlinear, Tunable and Light-Emitting All-Dielectric Metasurfaces Plenary [Show abstract]
  • Isabelle Staude, Friedrich Schiller University Jena, Germany
All-dielectric metasurfaces have been established as a versatile platform for manipulating light fields at the nanoscale. While initial research efforts were concentrated on purely passive structures, all-dielectric metasurfaces also hold a huge potential for dynamic control of light fields, as well as for tailoring light emission processes, such as spontaneous emission and nonlinear frequency generation. This talk will review our recent advances in nonlinear, tunable and light-emitting all-dielectric metasurfaces.
10:00 - 10:30 - Coffee break (Thursday morning)
10:30 - 12:30 - Oral sessions (Thursday morning)
10:30 - Special session on time-varying metamaterials (part 2)

Session chairperson(s): Harish Krishnaswamy

10:30 - 11:00 - 4D Metastructures: Merging Spatial and Temporal Metamaterials Invited oral [Show abstract]
  • Nader Engheta, University of Pennsylvania, USA
  • Victor Pacheco-Pena, Newcastle University, United Kingdom
  • Yasaman Kiasat, University of Pennsylvania, USA
  • Mario Junior Mencagli, University of Pennsylvania, USA
  • Ehsan Nahvi, University of Pennsylvania, USA
  • Brian Edwards, University of Pennsylvania, USA
We are exploring new phenomena and unique features of various mixtures of spatial and temporal metamaterials, providing novel 4-dimensional platforms for light-matter interaction. Several research thrusts are being studied in our group, including the anti-reflection temporal coatings, the effective-medium concepts for temporal metastructures, time-varying metastructures, the static-to-radiative and radiative-to-static field conversions, and freezing and amplifying waves using non-Foster concepts, just to name a few. In this talk, we present the results of some of our ongoing efforts in these areas.
11:00 - 11:30 - Metamaterials in Time and Metamaterials With Gain Invited oral [Show abstract]
  • John Pendry, Imperial College London, United Kingdom
  • Emanuele Galiffi, Imperial College London, UK
  • Paloma Huidobro, I.T. University of Lisbon, Portugal
Put your abstract here Much of our understanding of material properties is based on energy conservation, or the assumption than energy is not created within the material. Casting aside this assumption opens new possibilities for the response of such materials: input signals can be amplified on transmission, ‘superluminal’ bands can appear in which the group velocity exceeds the velocity of light in free space. Curiously in many instances input signals neither gain nor lose energy giving little hint that a source of energy is available. Metamaterials with gain and those with time dependence will be discussed with some simple insights.
11:30 - 12:00 - Towards Experimental Verification of Zero-reflection from Time-varying Capacitor Extended oral [Show abstract]
  • Silvio Hrabar, University of Zagreb, Croatia
  • Borna Jelacic, University of Zagreb, Croatia
  • Luka Mandic, University of Zagreb, Croatia
  • Jurica Papak, University of Zagreb, Croatia
A feasibility of experimental investigation of recently predicated zero-reflection from a time-varying reactive element is analyzed. It is shown that a capacitive bank with commercial CMOS switches is a promising candidate for a hardware demonstrator and preliminary experimental results will be presented at the conference.
12:00 - 12:15 - Instantaneous Control of Scattering From a Time-Modulated Meta-Atom Oral [Show abstract]
  • Grigorii Ptitcyn, Aalto University, Finland
  • Mohammad Mirmoosa, Aalto University, Finland
  • Sergei Tretyakov, Aalto University, Finland
Time-modulation of material parameters is a powerful tool that enables ultimate control over scattered light. Proper description of scattering from time-modulated materials should be written rigorously in the time domain. This becomes possible if the properties of a single time-varying meta-atom are also considered in the time domain. In this talk we will present a theoretical model which describes a time-variant meta-atom and its interaction with an incident electromagnetic wave. Based on the developed theory, we will present several peculiar applications of time-varying meta-atoms, such as cancellation of scattering and shifting the frequency of the scattered wave.
12:15 - 12:30 - Theory of Periodically Time-Varying Induced Exceptional Points of Degeneracy Oral [Show abstract]
  • Hamidreza Kazemi, University of California Irvine, USA
  • Mohamad Y. Nada, University of California Irvine, United States
  • Robert Marosi, University of California Irvine, USA
  • Tarek Mealy, University of California Irvine, USA
  • Ahmed F. Abdelshafy, University of California Irvine, USA
  • Filippo Capolino, University of California Irvine, USA
We present the novel concept of exceptional points of degeneracy (EPDs), which denote a coalescence of multiple eigenmodes, that directly emerge in systems when a linear time-periodic (LTP) variation is applied. Though the presented theory is general, as an example we establish the general conditions that yield an EPD in a single LTP LC resonator with a capacitance that varies periodically in time. We show a potential application of the proposed LTP system in making sensors to exploit the ultra-sensitivity associated with operating at an EPD.
10:30 - Acoustical and mechanical metamaterials (part 3)

Session chairperson(s): Guancong Ma

10:30 - 10:45 - Effect of hydrostatic pressure on a bubble anechoic metascreen Oral [Show abstract]
  • Margaux Thieury, Institut Langevin / MSC / Thales Underwater Systems, France
  • Arnaud Tourin, Institut Langevin, France
  • Jean Dasse, Thales Underwater Systems, France
  • Valentin Leroy, Laboratoire Matière et Systèmes Complexes, France
Bubble metascreens consist of a single layer of gas inclusions in an elastomer. They can be used as ultra-thin coatings for turning acoustic reflectors into perfect absorbers. The effectiveness of such a coating at a chosen frequency is mainly determined by three parameters: the size of the bubbles, the distance between them, and the rheology of the elastomer. If any of these parameters vary during the use of the coating, the performance is affected. We used numerical simulations to investigate the effect of the static pressure on the acoustic properties of bubble metascreens with spherical or cylindrical inclusions.
10:45 - 11:00 - 3D bandgaps in hybrid elastic metamaterials No show [Show abstract]
  • Federico Bosia, University of Torino, Italy
  • Anastasiia Krushynska, University of Groningen, The Netherlands
  • Pavel Galich, Technion–Israel Institute of Technology, Israel
  • Nicola Pugno, University of Trento, Italy
  • Stephan Rudykh, University of Wisconsin–Madison, USA
We propose a design strategy for hybrid metamaterials with alternating phononic plates and pentamode units that produce complete bandgaps at low-frequencies for elastic waves, thanks to two different scattering mechanisms. The design strategy can be applied to various configurations of phononic plates with cavities, inclusions or slender elements
11:00 - 11:15 - Experimental Investigation on Density Near Zero Plate-type Acoustic Metamaterial Oral [Show abstract]
  • Matthieu Malléjac, Le Mans Université, France
  • Aurélien Merkel, Universidad Carlos III de Madrid, Spain
  • José Sánchez-Dehesa, Universitat Politècnica de València, Spain
  • Johan Christensen, Universidad Carlos III de Madrid, Spain
  • Vincent Tournat, Le Mans Université, France
  • Vicent Romero-García, Le Mans Université, France
  • Jean-Philippe Groby, Le Mans Université, France
<p> The aim of this work is to experimentally, numerically and theoretically report and characterize the anomalous propagation of sound waves in a one-dimensional periodic system of thin elastic clamped plates emphasizing a hiding zone due to the near zero density regime.</p>
11:15 - 11:30 - Scalable Piezoelectric Effect in Silicon Doped Hafnium Oxide for Acoustic Wave Applications Oral [Show abstract]
  • Sven Kirbach, Fraunhofer IPMS - CNT, Germany
This paper presents the scalability of piezoelectricity in silicon doped hafnium oxide(Si:HfO2). From different thicknesses of 10 nm to 50 nm we obtained piezoelectric coefficients d33,f between 20 pm/V and 10 pm/V. During the cycling procedure a decreasing piezoelectric coefficient d33,f can be observed depending on the total number of cycles. Thus a specific piezoelectric condition can be set appropriating for the desired application.
11:30 - 12:00 - Experimental demonstration of a Willis metamaterial for elastic waves Invited oral [Show abstract]
  • Jensen Li, Hong Kong University of Science and Technology, Hong Kong
Here, we report the realization of Willis coupling on a structured beam with resonating cantilever structures and its resultant asymmetric propagation of flexural waves on such a beam. Willis coupling is the analogy of electromagnetic bianisotropy in elastic waves, which allows cross-coupling between stress and velocity or equivalently between momentum and strain. We will also discuss its extension to active media.
12:00 - 12:30 - Characterization of Phase Rigidity in Non-Hermitian Acoustic Systems Invited oral [Show abstract]
  • Guancong Ma, Hong Kong Baptist University, Hong Kong
By tuning of system parameters, a non-Hermitian system can be driven across a specific point in the parameter space, known as the exceptional point. At the exceptional point, the relevant eigenfrequencies of the system become degenerate, and the eigenvectors become parallel. Such behavior can be captured using a concept called phase rigidity. In this work, we present a theoretical analysis and experimental measurement of phase rigidities of a 2×2 and a 3×3 tight-binding non-Hermitian acoustic system. The 2×2 system is a well-known and well-characterized system that serves as a reference to show the effectiveness of our approach. The 3×3 system can produce an order-3 exceptional point at which three eigenmodes coalesce. Interestingly, we found that among the three eigenmodes, two approach the exceptional point with the same critical exponent and the same slope, whereas the third one has a different slope.
10:30 - Cloaking

Session chairperson(s): Tommaso Isernia

10:30 - 11:00 - Design of Invisibility Devices Through Artificial Materials: Further Possible Tools from the Inverse Scattering Perspective Invited oral [Show abstract]
  • Roberta Palmeri, DIIES - Università Mediterranea of Reggio Calabria, Italy
  • Martina Teresa Bevacqua, DIIES - Università Mediterranea of Reggio Calabria, Italy
  • Tommaso Isernia, DIIES - Università Mediterranea of Reggio Calabria, Italy
<p> The design of invisibility devices shows several common traits with inverse problems. In this contribution, some inverse scattering basic concepts are reconsidered to give additional point of views and possible new paths to follow for the design of invisibility devices.</p>
11:00 - 11:15 - A Novel 3D Printing Technique for Complex–Structured Metasurface Carpet Cloak Oral [Show abstract]
  • Qingxuan Liang, Xi'an Jiaotong University, China
A novel fabrication method based on 3D printing and injection molding of liquid metal is proposed to realize a cylindrical metasurface carpet cloak in microwave frequencies. The cloak exhibits good cloaking performance under both Ex and Ey polarization. The technique is flexible and especially suitable to fabricate metasurfaces with arbitrary shape. Moreover, it can be easily scaled to terahertz domain.
11:15 - 11:30 - Design of a Compact and Multifunctional Radiating Structure Exploiting the Mantle Cloaking Technique Oral [Show abstract]
  • Fabrizio Andreaus, Roma Tre University, Italy
  • Mirko Barbuto, Niccolo Cusano University, Italy
<p> In this contribution, we investigate the possibility to apply the mantle cloaking technique to radiation platforms consisting of a combination of different antenna types. More specifically, we consider the challenging case of a half-wavelength dipole working in close electrical proximity to an Archimedean spiral slot antenna. We show that by covering the dipole with a suitable cloaking metasurface, it is possible to significantly reduce its blockage on the Archimedean antenna and make it work as if it were isolated. We also show that the same system can be engineered to exploit the aperture antenna as a reflector for the dipole that, thus, can operate as a standard sector antenna. This cloaking application is confirmed by realistic full-wave numerical simulations.</p>
11:30 - 11:45 - Active Exterior Cloaking in Three-Dimensional Acoustics No show [Show abstract]
  • Cheuk-Him Yeung, University of Manchester, United Kingdom
  • William Parnell, University of Manchester, United Kingdom
  • Tom Shearer, University of Manchester, United Kingdom
The Kirchhoff integral theorem is exploited to construct an acoustic cloak in three dimensions using a number of active sources. We apply the addition theorem for Bessel functions to replace the continuous source distribution by multipolar point sources. Expressions for the multipole amplitudes are derived for certain uniform source arrangements.
11:45 - 12:00 - Novel wave phenomena to be identified on artificial soils made of deep piles Oral [Show abstract]
  • Stephane Brule, Institut Fresnel, France
  • stefan Enoch, Institut Fresnel, France
  • Sébastien Guenneau, Institut Fresnel, France
In very particular cases of soil conditions, some authors evoke the phenomenon of “double resonance” during an earthquake. The seismic signal induces the resonance of the sediments filling the basin, causing the selective resonance of the buildings at the ground free surface. However, buried and slender structures in very soft soil, such as deep piles, can also be solicited on their first fundamental modes. This local resonance effect is essential in the feasibility of seismic metamaterials.
12:00 - 12:30 - Controlling Seismic Elastic Surface Waves via Interacting Structures Extended oral [Show abstract]
  • Bogdan Ungureanu, Imperial College London, United Kingdom
  • Sébastien Guenneau, Aix Marseille Univ., France
  • Stéphane Brûlé, Aix Marseille Univ., France
  • Richard Craster, Imperial College London, United Kingdom
<p> We present some recent research advances on controlling elastic surface waves in thin and thick plates, this is aimed at understanding the seismic wave trajectories in soils structured with buildings. We show the influence of building interactions on surface and body waves when a significant proportion of soil is replaced by inclusions with different densities and Lamé coefficients acting as building foundation, raising the question of the effective dynamic properties of these smart soils. One of our objectives is to improve the control of seismic waves by taking into consideration the in-plane twisting motion of local helical resonators.</p>
10:30 - Special session on metamaterials for life-science applications (part 2)

Session chairperson(s): Giuseppe Strangi

10:30 - 10:45 - Design of Frequency Selective Devices for the THz Domain with Applications on Structural Health Monitoring Oral [Show abstract]
  • João Pedro Pavia, Instituto de Telecomunicações/ISCTE-IUL, Portugal
  • Marco Alexandre Ribeiro, Instituto de Telecomunicações/ISCTE-IUL, Portugal
  • Nuno Souto, Instituto de Telecomunicações/ISCTE-IUL, Portugal
In this paper, a study on the transmittance as a function of applied force for a new THz sensor is proposed. The sensor consists of two frequency selective surfaces (FSSs) based on metamaterial wire resonators and works as a re-configurable selective THz filter in which only radiation of certain desired frequencies is allowed to pass. Numerical modelling of both the mechanical and electromagnetics behavior of the sensor is reported for a device assembled with a High-Density PolyEthylene (HDPE) thermoplastic polymer host at a target frequency of 408 GHz.
10:45 - 11:00 - Meta-optics inspired configurations for magnetic resonance imaging applications Oral [Show abstract]
  • Carlo Rizza, CNR-SPIN, Italy
  • Marco Fantasia, MESVA, University of L'Aquila, Italy
  • Elia Palange, DIIIE, University of L'Aquila, Italy
  • Marcello Alecci, MESVA, University of L'Aquila, Italy
  • Angelo Galante, MESVA, University of L'Aquila, Italy
We deal with the topics of the metamaterial-based systems in the field of magnetic resonance imaging (MRI). We show our recent results where we consider a novel and alternative use of a magnetic metamaterial to increase the performances of an RF surface coil in an MRI experiment. We prove that our proposed configuration holds great potential to enhance the MRI signal to noise ratio with respect to the standard setup.
11:00 - 11:30 - Metasurfaces For Biosensing and BioImaging Invited oral [Show abstract]
  • Hatice Altug, EPFL, Swiss Federal Institute in Lausanne, Switzerland
Nanophotonics has been unveiling a plethora of new optical phenomena, yet a critical issue ahead is the development of novel devices and applications taking advantage of nano-scale effects. Here, I will cover our work on dielectric and plasmonic metasurfaces for biosensing and bioimaging applications and their use in real-world settings.
11:30 - 11:45 - Ablation of Deep-Seated Brain Tumors Using Metasurfaces Oral [Show abstract]
  • Mohamad-Javad Haji-Ahmadi, University of Tehran, Iran
  • Reza Faraji-Dana, University of Tehran, Iran
  • Christophe Caloz, Polytechnique Montreal, Canada
We leverage the wavefront shaping capability of metasurfaces to generate optimally focused fields for the ablation of deep-seated brain tumors. We obtain the optimal wavefront profile via the concept of time-reversal focusing and design the corresponding metasurface using the generalized sheet transition condition (GSTC) method. Preliminary simulation for a flat metasurface placed at the back of the head already demonstrate promising focusing resolution compared with conventional hyperthermia techniques.
11:45 - 12:00 - Sensing Biological Fluids using Resonating Surface Plasmon Polaritons in the THz Range Oral [Show abstract]
  • Gian Paolo Papari, Università di Napoli Federico II, Italy
  • Can Koral, INFN Naples Unit, Italy
  • Antonello Andreone, Università di Napoli Federico II, Italy
<p> We study the sensitivity of two different metagrids to the presence of biological fluids on the surface. When a THz beam impinges on each metagrid capped with a dielectric substrate, peaks in transmission related to the onset of high order surface plasmon polaritons appear and allow to estimate the properties of a guest fluid filling the partition volume with a very high sensitivity, comparable with record literature values.</p>
12:00 - 12:30 - Rapid spectroscopic cytopathology using plasmonic metasurfaces: from drug screens to characterization of flowing cells mixtures Invited oral [Show abstract]
  • Gennady Shvets, Cornell U., USA
Optical spectroscopy is a powerful technique that allows for label-free, noninvasive, and real time characterization of biomolecules. Compared with other optical techniques that relies on the shift of a single resonance, such as surface plasmon resonance (SPR) sensors and optical-grating-based cell assays, spectroscopic techniques can discriminate between different chemical species and are suited for analyzing complex biological samples. Here, we demonstrate the use of metasurface-enhanced infrared reflection spectroscopy (MEIRS) to observe and characterize live cells cultured on top of the plasmonic metasurface. MEIRS has a penetration depth on the order of tens of nanometers, making it uniquely suited for probing the surface of a cell, and for observing features such as protein expression in the cell membrane and cellular adhesion. This has important implications in the detection of cancer cells through spectroscopic cytology, as cancer cells significantly differ from the normal ones in the expression of membrane proteins and adhesion molecules. In this work, we demonstrate the observation of cancer cell adhesion through IR spectroscopic mapping. Furthermore, we show that MEIRS can be used to observe the effect of different anticancer cocktails. Finally, we demonstrate how metasurfaces can be used as radio-frequency electrodes for differentiated attraction of the cells that act as core-shell nanoparticles with frequency-dependent polarizability. Once attracted from the flow to the metasurface, the cells can be spectroscopically characterized using MEIRS.
12:30 - 14:00 - Lunch break (Thursday)
14:00 - 15:30 - Oral sessions (Thursday - afternoon 1)
14:00 - Fabrication and experiment (part 2)

Session chairperson(s): Anthony Grbic

14:00 - 14:15 - Fabrication of freestanding metasurfaces for optical frequencies Oral [Show abstract]
  • Mike Prämassing, Universität Bonn, Germany
  • Till Leuteritz, Universität Bonn, Germany
  • Alexander Fassbender, Universität Bonn, Germany
  • Stephan Irsen, Center of advanced european studies and research (caesar), Germany
  • Stefan Linden, Universität Bonn, Germany
We report on the fabrication of freestanding metasurfaces operating at optical frequencies consisting of a 40 nm thick nanostructured gold film. As a first example, we present a metasurface lens composed of V-shaped nanovoids. In the second example, we discuss a metasurface phase plate for the generation of Laguerre-Gaussian beams.
14:15 - 14:30 - Advanced in Novel Photonic Materials and Novel Phenomena Enabled by Crystal Growth Oral [Show abstract]
  • Dorota Pawlak, University of Warsaw, Italy
  • P. Paszke, University of Warsaw, Poland
  • R. Nowaczyński, University of Warsaw, Poland
  • K. Szlachetko, University of Warsaw, Poland
  • P. Piotrowski, University of Warsaw, Poland
  • M. Tomczyk, University of Warsaw, Poland
  • K. Sadecka, Institute of Electronic Materials Technology, Poland
  • A. Materna, Institute of Electronic Materials Technology, Poland
  • B. Surma, Institute of Electronic Materials Technology, Poland
  • A. Belardini, Sapienza Università di Roma, Ita
  • J. Toudert, Instituto de Óptica, Spain
  • C. Sibilia, Sapienza Università di Roma, Italy
<p> Recent advances in development of novel materials enabled by the crystal growth will be presented. This will include such materials as volumetric nanoplasmonic materials in visible and infrared, passive and active nanomaterials. It will also include various unusual phenomena such as metastable photoluminescent defects in nanoplasmonic materials.</p>
14:30 - 14:45 - Engineering Structural and Optical Properties of 3D Chiral Dielectric Nanostructures Oral [Show abstract]
  • Mariachiara Manoccio, University of Salento, CNR-Nanotec, Italy
  • Marco Esposito, CNR-Nanotec, Italy
  • Vittorianna Tasco, CNR-Nanotec, Italy
  • Massimo Cuscunà, CNR-Nanotec, Italy
  • Adriana Passaseo, CNR-Nanotec, Italy
<p> In this work we analyzed 3D chiral dielectric nano-helix arrays for nanophotonic devices made with focus electron beam induced deposition. This technique allows to vary the geometrical parameters of the periodic structures providing their action the visible range with high values of circular dichroism. The possibility to modify the structural parameter allow the realization of different geometrical arrangement ranging from chiral photonic crystal-like , to a metamaterial-like structures across intermediate regions between them, opening the way to new nanophotonic applications.</p>
14:45 - 15:15 - Using Optical Tweezers to Assemble Micro-spheres within Metamaterials that Achieve Engineered Wave Propagation Properties Extended oral [Show abstract]
  • Lucas Shaw, University of California, Los Angeles, United States
  • Samira Chizari, University of California, Los Angeles, United States
  • Miles Lim, University of California, Los Angeles, United States
  • Michael Porter, University of California, Los Angeles, United States
  • Sydney Austin, University of California, Los Angeles, United States
  • Jonathan Hopkins, University of California, Los Angeles, United States
This work introduces a method to fabricate metamaterials that consist of carefully organized micro-spheres using optical tweezers. Due to the nonlinear stiffness that results at the junction between such micro-spheres, these metamaterials give rise to nonlinear stress-wave propagation properties that enable various applications (e.g., acoustic lenses, sound scramblers, and armor).
15:15 - 15:30 - Quantitative Phase Imaging of Plasmonic Metasurfaces Oral [Show abstract]
  • Vlastimil Křápek, Brno University of Technology, Czech Republic
  • Petr Dvořák, Brno University of Technology, Czech Republic
  • Alexander Faßbender, Universität Bonn, Germany
  • Petr Bouchal, Brno University of Technology, Czech Republic
  • Martin Hrtoň, Brno University of Technology, Czech Republic
  • Jiří Babocký, Brno University of Technology, Czech Republic
  • Filip Ligmajer, Brno University of Technology, Czech Republic
  • Radim Chmelík, Brno University of Technology, Czech Republic
  • Stefan Linden, Universität Bonn, Germany
  • Tomáš Šikola, Brno University of Technology, Czech Republic
We present two novel real-time, wide-field, and quantitative light-microscopy techniques enabling phase imaging of electromagnetic fields. Coherence-controlled holographic microscopy enables three-dimensional phase imaging of metasurfaces. Quantitative 4th generation optical microscopy is the first diffraction-limited non-scanning phase imaging technique capable to detect a single building block of a metasurface. The performance of the techniques is demonstrated for several metasurfaces.
14:00 - Non-reciprocal metamaterials (part 2)

Session chairperson(s): Mario Silveirinha

14:00 - 14:30 - Breaking Lorentz Reciprocity to Overcome the Time-Bandwidth Limit Invited oral [Show abstract]
  • Kosmas Tsakmakidis, National and Kapodistrian University of Athens, Greece
<p> All resonant systems in physics and engineering, independent of their physical implementation, have a bandwidth that is inversely proportional to the decay time. A similar limitation exists for standard slow-light (waveguiding) systems, where the group index (and thus the delay, for a given footprint) is inversely related to the bandwidth. Therefore, resonant or slow-light systems can either store a broad signal for a short time, or a narrow signal for a long time, but cannot achieve large delay for broad bandwidth signals. Here, we discuss our recent work on non-reciprocal optical systems that are not constrained by the delay-bandwidth limit. We show that large and, simultaneously, broadband optical delay is achievable with current optical technology. We discuss the underlying physics of delay and bandwidth in non-reciprocal optical systems and present an experimental implementation, based on a figure-9 cavity. We demonstrate a delay-bandwidth product 30 times above the “fundamental” limit of traditional (reciprocal) systems. Furthermore, we show that the optical pulse can be released after an arbitrary number of round trips, providing the control and tunability lacking from conventional spiral waveguide or fiber loop delay lines.</p>
14:30 - 15:00 - N-Way, Ultra-Broadband, Magnetic-Free Non-Reciprocity Based on Angular Momentum Biasing in Commutated Multipath Networks With Infinitesimal Form-Factor Extended oral [Show abstract]
  • Aravind Nagulu, Columbia University, USA
  • Mykhailo Tymchenko, The University of Texas at Austin, USA
  • Andrea Alu, City University of New York, USA
  • Harish Krishnaswamy, Columbia University, USA
Recent research has revealed the possibility to achieve magnetic-free non-reciprocity using spatio-temporal modulation. Some approaches use traveling-wave-like permittivity modulation along a transmission line or in a resonant ring structure to achieve non-reciprocity. However, small permittivity modulation contrasts result in large device form-factors or narrow bandwidths of operation, along with high insertion loss at high frequencies. More recent approaches leverage much larger contrasts of conductivity modulation available in standard semiconductors processes to achieve drastically smaller form-factors and low-loss non-reciprocity, albeit over narrow operation bandwidths. In this work, we present a novel approach to realize an ultra-broadband, highly reconfigurable, non-reciprocal delay element based on staggered commutation in multipath networks. This topology overcomes the delay-bandwidth product limitations incurred in linear time-invariant systems. We also combine this concept with the angular momentum biasing approach to realize an highly-reconfigurable, ultra-broadband N-port circulator. We corroborate our findings by simulating a 8-path delay element and an 8-port circulator comprised of commutated network with 8 branches.
15:00 - 15:15 - Nonreciprocal Phase Gradient Metasurface: Principle And Transistor Implementation Oral [Show abstract]
  • Guillaume Lavigne, Polytechnique Montreal, Canada
  • Christophe Caloz, Polytechnique Montreal, Canada
We introduce the concept of nonreciprocal nongyrotropic phase gradient metasurfaces. Such metasurfaces are based on bianisotropic phase shifting unit cells, with the required nonreciprocal and nongyrotropic characteristics. Moreover, we present a transistor-based implementation of a nonreciprocal phase shifting subwavelength unit cell. Finally, we demonstrate the concept with a simulation of a 6-port spatial circulator application.
15:15 - 15:30 - Low-Loss Hexaferrite Self-Biased Microstrip and CPW Circulators Oral [Show abstract]
  • Sumin Joseph, University of Liverpool, United Kingdom
  • Richard Lebourgeois, Thales Research & Technology, France
  • Yi Huang, University of Liverpool, United Kingdom
  • Laurent Roussel, Thales LAS OME, France
  • Alex Schuchinsky, University of Liverpool, United Kingdom
Newly developed La-Co substituted hexaferrite compounds are explored and used for self-biased microstrip and CPW circulators. The novel materials enable the insertion loss of the Ku band circulators to be reduced for more than a half, while maintaining the high isolation and return loss across 5% frequency band.
14:00 - Extreme parameters

Session chairperson(s): John Pendry

14:00 - 14:15 - Implementation Aspects of Multiresonant Metasurfaces for Broadband Group Delay Oral [Show abstract]
  • Odysseas Tsilipakos, Foundation for Research and Technology Hellas, Greece
  • Thomas Koschny, Ames Laboratory and Iowa State University, USA
  • Maria Kafesaki, Foundation for Research and Technology Hellas, Greece
  • Costas Soukoulis, Foundation for Research and Technology Hellas & Ames Laboratory and Iowa State University, Greece & USA
We design multiresonant metasurfaces offering broadband group delay in reflection, based on the spectral interleaving of electric and magnetic Lorentzian resonances. We demonstrate a metasurface at 10 GHz comprising five meta-atoms in a subwavelength unit cell that can delay broadband 700-MHz-wide pulses without distorting the pulse shape.
Media link(s):

See recent work here (https://doi.org/10.1021/acsphotonics.7b01415)

 

14:15 - 14:30 - Faraday cage of interlaced wire metamaterial becomes transparent No show [Show abstract]
  • Dmitry Dobrykh, ITMO University, Russia
  • Ildar Yusupov, ITMO University, Russia
  • Dmitry Filonov, ITMO University, Russia
  • Ivan Iorsh, ITMO University, Russia
  • Pavel Belov, ITMO Universty, Russia
We study wire metamaterial consisting of two displaced subsets of three-dimensional connected wire media. This very unusual metamaterial supports no-cutoff isotropic longitudinal modes at low frequencies. These modes are bulk plasmons of the medium with extremely high spatial dispersion. We do demonstrate unexpectedly high propagation through a Faraday cage formed by interlaced wire metamaterial due to these modes.
14:30 - 14:45 - PT-Symmetric Cladding Layers for high-Q Brewster Modes and Embedded Eigenstates Oral [Show abstract]
  • Zarko Sakotic, BioSense Institute, Serbia
  • Alex Krasnok, Advanced Science Research Center, City University of New York, United States of America
  • Norbert Cselyuszka, BioSense Institute, Serbia
  • Nikolina Jankovic, BioSense Institute, Serbia
  • Andrea Alù, Advanced Science Research Center, City University of New York, United States of America
In this work we address embedded eigenstates using epsilon near-zero materials and present a strategy to tackle the losses of ENZ materials in order to produce unbounded high-Q resonances with the use of PT-symmetry and the concept of suppressed leakage.
14:45 - 15:00 - Propagation of Dirac-cone Modes in Photonic Crystal Slabs Oral [Show abstract]
  • Kazuaki Sakoda, National Institute for Materials Science, Japan
  • Yuanzhao Yao, National Institute for Materials Science, Japan
  • Naoki Ikeda, National Institute for Materials Science, Japan
  • Takashi Kuroda, National Institute for Materials Science, Japan
  • Takaaki Mano, National Institute for Materials Science, Japan
  • Hiromi Koyama, National Institute for Materials Science, Japan
  • Yoshimasa Sugimoto, National Institute for Materials Science, Japan
We report the theoretical study on the propagation of Dirac-cone modes in photonic crystal slabs. We focus on the absence of light scattering due to the vanishing refractive index, the beam shape emitted from the slab surface, and the reflection spectra of non-Hermitian systems.
15:00 - 15:30 - Phonon-Polaritonic Metasurfaces Based on 2D Materials Invited oral [Show abstract]
  • Rainer Hillenbrand, CIC nanoGUNE, Spain
Phonon polaritons in 2D materials exhibit ultra-short wavelengths, long lifetimes and strong field confinement, which allows for nanoscale control of infrared light. Here, we discuss real-space nanoimaging of infrared phonon polaritons in boron nitride and molybdenum trioxide metasurfaces, revealing intriguing aspects such as polariton propagation with anomalous wavefronts.
14:00 - Modelling (part 2)

Session chairperson(s): Sebastien Guenneau

14:00 - 14:15 - Menger Fractal Acoustic Metamaterials With Double-Negative Property Oral [Show abstract]
  • Yu Liu, Chinese Academy of Sciences, China
  • Wenshuai Xu, Chinese Academy of Sciences, China
  • Meng Chen, Chinese Academy of Sciences, China
  • Heng Jiang, Chinese Academy of Sciences, China
  • Yuren Wang, Chinese Academy of Sciences, China
Put your abstract here We construct new three-dimensional fractal acoustic metamaterials by adopting Menger structure and calculate the effective parameters of them, the results show the structures have excellent double-negative property with a single structure.
14:15 - 14:30 - Advanced Control of Invisible Cavity Resonators with Bianisotropic Metasurfaces Oral [Show abstract]
  • Francisco Cuesta, Aalto University, Finland
  • Jingbo Li, Duke University, United States of America
  • Ana Diaz-Rubio, Aalto University, Finland
  • Viktar Asadchy, Aalto University, Stanford University, Finland, United States of America
  • Steven Cummer, Duke University, United States of America
  • Sergei Tretyakov, Aalto University, Finland
Recently, invisible cavities formed by two parallel metasurfaces have demonstrated the ability to support so-called “driven” bound states in the continuum. The existence of these modes allows excitation of non-scattering resonant cavities with strongly enhanced fields inside the resonator volume. These invisible cavity resonators have been proposed for several applications such as sensor enhancement and cloaking. In this work, we propose and analyse invisible cavity resonators formed by two bianisotropic metasurfaces. Our results show that resonant cavities made of bianisotropic metasurfaces allow rather general control of the distribution of field inside the resonant volume between the metasurfaces and offer a possibility to design invisible resonant cavities of arbitrary thickness.
14:30 - 15:00 - A Metasurface Based Mode Converter Extended oral [Show abstract]
  • Faris Alsolamy, University of Michigan, Department of Electrical Engineering and Computer Science - Ann Arbor, USA
  • Anthony Grbic , University of Michigan, Department of Electrical Engineering and Computer Science - Ann Arbor, USA
We report a mode converter using reflectionless metasurfaces. The mode converter consists of five inhomogeneous electric sheets cascaded within a cylindrical waveguide. The sheet profiles are calculated analytically using a modal wave matrix formulation. The modal wave matrices are derived using the Discrete Hankel Transform. The design example is simulated using a commercial electromagnetic solver to verify the proposed design approach.
15:00 - 15:15 - Higher Order Huygens’ Metasurfaces for Holograms and Perfect Absorbers Oral [Show abstract]
  • Carsten Rockstuhl, Karlsruhe Institute of Technology, Germany
  • Aso Rahimzadegan, Karlsruhe Institute of Technology, Germany
  • Rasoul Alaee, University of Ottawa, Canada
  • David Dams, Karlsruhe Institute of Technology, Germany
  • Achim Groner, Karlsruhe Institute of Technology, Germany
  • Denis Arslan, Friedrich Schiller University Jena, Germany
  • Thomas Pertsch, Friedrich Schiller University Jena, Germany
  • Isabelle Staude, Friedrich Schiller University Jena, Germany
  • Ivan Fernandez-Corbaton, Karlsruhe Institute of Technology, Germany
We consider dipolar-quadrupolar metasurfaces operated in the Huygens’ regime. When compared to previously considered dipolar Hyugens’ metasurfaces, they offer a much more profound control on the amplitude and phase of the transmitted field. We demonstrate two applications. First, we signify the necessity of quadrupolar moments in the constituents to enable a full 2π phase-shift coverage in the transmitted wave at a fixed frequency. Second, perfect absorbers with quadrupolar constituents are explored.
15:15 - 15:30 - Wave Propagation In Poro-elastic Materials Using A Shifted Cell Method For Theory Of Biot Oral [Show abstract]
  • Sepide Ahsani, KU Leuven, Belgium
  • Claus Claeys, KU Leuven, Belgium
  • Elke Deckers, KU Leuven, Belgium
  • Wim Desmet, KU Leuven, Belgium
In this paper, we propose a weak formulation for the Biot theory of poro-elastic materials to calculate the dispersion properties of non-trivial realization of porous material. This formulation considers the periodicity within the field variables which are solid displacements and pressure in pores, resulting in a quadratic eigenvalue problem in terms of wavenumber.
15:30 - 16:00 - Coffee break (Thursday afternoon)
16:00 - 18:00 - Oral sessions (Thursday - afternoon 2)
16:00 - Plasmonics (part 3)

Session chairperson(s): Stefan Linden

16:00 - 16:30 - Plasmon-Exciton Coupling: Light-forbidden Transitions and Quasichiral Interactions Invited oral [Show abstract]
  • Antonio I. Fernández-Domínguez, Universidad Autónoma de Madrid, Spain
<p> We present two plasmon-exciton coupling phenomena emerging due to the deeply sub-wavelength nature of surface plasmon (SP) resonances. On the one hand, the modification of the Purcel and Rabi phenomenology due to light-forbidden exciton transtions in the emitter level structure. On the other hand, the ocurrence of quasichiral, non-reciprocal interactions among circularly polarized emitters on top of a flat metal surface.</p>
16:30 - 16:45 - Bi2O3-Ag plasmonic eutectic composite as an example of surface enhanced Raman scattering from volumetric material Oral [Show abstract]
  • Kamil Szlachetko, University of Warsaw, Poland
  • Piotr Piotrowski, University of Warsaw, Poland
  • Katarzyna Sadecka, Institute of Electronic Materials Technology, Poland
  • Pawel Osewski, Institute of Electronic Materials Technology, Poland
  • Dobroslawa Kasprowicz, Poznan University of Technology, Poland
  • Dorota Anna Pawlak, University of Warsaw, Poland
<p> Surface Enhanced Raman Scattering (SERS) is a powerful tool in chemical analysis and characterization of extremely low concentrated materials. Despite many advantages, due to surface nature of SERS, it is limited to locally modified surfaces. At this work we demonstrate enhanced Raman scattering effect from real volumetric plasmonic material Bi2O3-Ag.</p>
16:45 - 17:15 - Nonlocality and singular metasurfaces Extended oral [Show abstract]
  • Fan Yang, Imperial College London, United Kingdom
  • Yao-Ting Wang, Imperial College London, United Kingdom
  • Paloma Huidobro, Imperial College London, United Kingdom
  • John Pendry, Imperial College London, United Kingdom
The far field spectrum of plasmonic metasurface with sharp features is very sensitive to nonlocality in the metal such that the continuous nature of spectrum now becomes discrete and the microscopic nonlocal effects can be unveiled from far field measurements.
17:15 - 17:30 - Conformal Transformation in Bowtie Nanoantennas and Nanocavities: Unveiling Hidden Symmetries Oral [Show abstract]
  • Victor Pacheco Peña, Newcastle University, United Kingdom
  • Rúben Alves, University of Birmingham, United Kingdom
  • Miguel Navarro-Cía, University of Birmingham, United Kingdom
<p> Bowtie nanoantennas and nanocavities are analyzed using conformal transformation. Their performance is studied in terms of the non-radiative Purcell enhancement and self-induced optical forces experienced by quantum emitters. It is demonstrated how these two geometrically different plasmonic nanoparticles can share the same non-radiative Purcell spectra. This hidden symmetric response is unveiled by properly applying the conformal transformation technique, demonstrating that both nanoparticles share the same transformed geometry.</p>
17:30 - 17:45 - Cooperative Energy Transfer Controls the Spontaneous Emission Rate Beyond Field Enhancement Limits Oral [Show abstract]
  • Giuseppe Strangi, Case Western Reserve University, USA
  • Mohamed ElKabbash, Case Western Reserve University, USA
  • Tigran V. Shahbazyan, Jackson State University, USA
  • Jesse Berezovski, Case Western Reserve University, USA
  • Francesco De Angelis, Istituto Italiano di Tecnologia, Italy
<p> Here, we demonstrate significant acceleration of quantum emitter spontaneous emission (SE) rate in a plasmonic nano-cavity due to cooperative energy transfer (CET) from plasmon-correlated emitters. The accelerated SE rate exceeds the rate acceleration experienced by individual emitters due to local field enhancement. Plasmon-assisted CET offers unprecedented control over the SE rate and allows to dynamically modulate the spontaneous emission rate at room temperature enabling an SE rate based optical modulator.</p>
17:45 - 18:00 - Single- and Multi-Channel Nonlinear Phenomena in Resonant Structures Comprising Graphene Oral [Show abstract]
  • Odysseas Tsilipakos, Foundation for Research and Technology Hellas, Greece
  • Thomas Christopoulos, Aristotle University of Thessaloniki, Greece
  • Georgios Sinatkas, Aristotle University of Thessaloniki, Greece
  • Emmanouil Kriezis, Aristotle University of Thessaloniki, Greece
We consider single- and multi-channel nonlinear phenomena in resonators comprising graphene to exploit its high third-order nonlinearity. We study optical bistability and four-wave mixing employing a recently developed perturbation/coupled mode theory framework. We find low power requirements and high conversion efficiencies, respectively, highlighting graphene’s potential for nonlinear applications.
Media link(s):

See recent work: https://doi.org/10.1103/PhysRevB.98.235421, https://doi.org/10.1063/1.5005610

16:00 - Special session on time-varying metamaterials (part 3)

Session chairperson(s): Stefano Vellucci

16:00 - 16:15 - Ultra-Compact, Passive, Reconfigurable, CMOS Circulator-Coupler Based on Commutated Multipath Networks Oral [Show abstract]
  • Aravind Nagulu, Columbia University, USA
  • Mykhailo Tymchenko, The University of Texas at Austin, USA
  • Andrea Alu, City University of New York, USA
  • Harish Krishnaswamy, Columbia University, USA
Integrated passives such as couplers typically occupy a substantial area. Various miniaturization techniques based on lumped components, coupled microstrips and active approaches were proposed in the past but have seen limited use due to technological constraints and/or issues of bandwidth, linearity and noise performance. Recent works on reconfigurable quasi-electrostatic wave propagation in commutated multi-path networks have revealed new possibilities to miniaturize reciprocal and non-reciprocal electronic components through temporal modulation without the use of magnetic materials, making them fully compatible with CMOS fabrication. In this work, we propose a single reconfigurable Swiss-Army-Knife electronic device which can be configured to act as a rat-race coupler, a branch-line coupler, or a 3-port circulator. The device is realized using four arrays of commutated shunt capacitors connected in a loop, with four ports attached in between. We corroborate our findings by designing and simulating a prototype device to be implemented in a standard 65nm CMOS process.
16:15 - 16:30 - Tailoring non-reciprocity in discretely modulated plates Oral [Show abstract]
  • Emanuele Riva, Politecnico di Milano, Italy
  • Gabriele Cazzulani, Politecnico di Milano, Italy
  • Matteo Di Ronco, Politecnico di Milano, Italy
  • Francesco Braghin, Politecnico di Milano, Italy
We investigate nonreciprocal wave propagation in discretely modulated plates using a generalization of the Plane Wave Expansion Method. This new analysis tool allows to compute the band diagram for a wider class of spatiotemporal materials, which are able to break reciprocity principle along different wave propagation directions.
16:30 - 16:45 - Space-Time-Coding Digital Metasurfaces Oral [Show abstract]
  • Lei Zhang, Southeast University, China
  • Xiao Qing Chen, Southeast University, China
  • Shuo Liu, Southeast University, China
  • Qian Zhang, Southeast University, China
  • Jie Zhao, Southeast University, China
  • Jun Yan Dai, Southeast University, China
  • Guo Dong Bai, Southeast University, China
  • Xiang Wan, Southeast University, China
  • Qiang Cheng, Southeast University, China
  • Giuseppe Castaldi, University of Sannio, Italy
  • Vincenzo Galdi, University of Sannio, Italy
  • Tie Jun Cui, Southeast University, China
We study, theoretically and experimentally, space-time modulated digital coding metasurfaces that enable simultaneous manipulations of electromagnetic waves in both space and frequency domains, including harmonic beam steering/shaping and scattering-signature control. Our results may find interesting applications to a variety of fields, including wireless communications, cognitive radars, adaptive beamforming, and holographic imaging.
16:45 - 17:00 - Spacetime-Modulated Metasurface for Spatial Multiplexing Communication Oral [Show abstract]
  • Xiaoyi Wang, Polytechnique Montréal, Canada
  • Christophe Caloz, Polytechnique Montréal, Canada
We present a metasurface that is spacetime-modulated to perform spatial multiplexing. This metasurface is made of a 2D array of patches on a grounded substrate that operates as a mirror with two phase reflection states provided by connecting or disconnecting the patches to the ground with integrated diodes controlled by an external processing unit. Each column of the metasurface is temporally-modulated by a different code from a set of orthogonal codes, which are here Hadamard-Walsh sequences. Compared to conventional spatial multiplexing, this metasurface-based multiplexing technology provides the advantage of requiring only one transmitting antenna rather than an array of antennas with complex, bulky and costly feeding network. The spacetime multiplexing metasurface is demonstrated by successfully routing two data streams to two different users located at different positions. This concept may even more immediately be applied to dynamically deflect incoming waves to different direction of space via the spacetime coding, hence providing an unprecedented technique for tunable generalized reflection-refraction.
17:00 - 17:30 - Time-Modulated Metamaterials Invited oral [Show abstract]
  • Andrea Alù, CUNY Advanced Science Research Center, USA
Spatial and temporal modulations have introduced in recent years exciting new knobs in the context of exotic wave interactions with metamaterials. In this talk, I review some of our recent progress in pushing the boundaries of metamaterial technology through the use of suitable temporal and spatio-temporal modulation schemes. I will focus on opportunities offered by temporal modulation to break reciprocity, enhance bandwidths of operation of devices, and mold the topology of the band diagram in periodic systems. Physical insights into the observed phenomena and opportunities for applications will be discussed during the talk.
17:30 - 17:45 - Diffraction Theory of Spatiotemporally Periodic Gratings Oral [Show abstract]
  • Sajjad Taravati, University of Toronto, Canada
  • George V. Eleftheriades, University of Toronto, Canada
We present the theory of the diffraction of electromagnetic waves by generalized space-time periodic diffraction gratings. It is shown that such gratings produce spatial and temporal diffraction orders, yielding a quite unique diffraction pattern, not seen in conventional spatially periodic diffraction gratings. We show that in contrast with conventional static gratings, space-time periodic diffraction gratings generate both spatial and temporal diffraction orders, where each spatial diffraction order is formed by an infinite set of temporal diffraction orders. Such dynamic gratings offer enhanced functionalities and unique characteristics, e.g., an asymmetric diffraction pattern, nonreciprocal transmissive and reflective diffraction, and enhanced diffraction efficiency. In addition, the theoretical analysis of the structure is supported by time and frequency domain FDTD numerical simulation results.
17:45 - 18:00 - Floquet Analysis of a Time-Modulated Metasurface Oral [Show abstract]
  • Francis Salas, University of Michigan, USA
  • Zhanni Wu, University of Michigan, USA
  • Cody Scarborough, University of Michigan, USA
  • Anthony Grbic, University of Michigan, USA
A Floquet scattering matrix method is presented for the characterization and design of a time-modulated metasurface. The analysis is applied to a metasurface composed of two tunable, shunt resonators separated by an impedance inverter. The tunable shunt resonators are composed of an inductor and an anti-series varactor pair biased with a time-modulated waveform. The technique is shown to accurately predict the magnitude and phase of the reflected and transmitted voltage and current harmonics.
16:00 - Acoustical and mechanical metamaterials (part 4)

Session chairperson(s): Vicente Romero García

16:00 - 16:15 - Tsunami Lens Oral [Show abstract]
  • Sang-Hoon Kim, Mokpo National Maritime University, Korea (South)
A removable tsunami lens made of expandable rubber pillars or balloons of acoustic Eaton lenses is proposed theoretically. The lens array creates a stop-band by rotating the incoming tsunami wave and reduces the pressure by canceling each other. The diameter of a lens is order of the wavelength of the tsunami at the coast, that is, a kilometer. Before appearing a tsunami, the Eaton balloons are buried underground near the coast in folded or rounded form. Upon sounding of the tsunami alarm, water and air are pumped into the pillars, which expand and erect the wall above the sea level. After the tsunami, the water and air are released from the pillars, which are then buried underground for reuse. Electricity is used to power the entire process. Numerical simulations with some tsunami models are carried out.
16:15 - 16:30 - Acoustic Subwavelength Networks for Waveguiding Oral [Show abstract]
  • Olivier Richoux, LAUM, UMR-CNRS 6613, Le Mans University, France
In this work, we demonstrate (both theoretically and numerically) that an acoustic resonant subwavelength three-port can be used to obtain at the same time a symmetric splitter and a symmetric combiner with a perfect transmission despite the presence of losses in the system. The device is composed of waveguides side-loaded by resonant scatterers. The control of the wave is made possible using the interaction of the resonances of each scatterers through the waveguide. Tuning these resonances, this system can provide multi-functionalities with a very small amount of losses during the propagation offering a large panel of applications in the field of acoustic waves routing or manipulation. Two examples of 4-ports system made by the combination of 3-ports systems with prescribed wave guiding properties are shown demonstrating the abilities of this type of systems to route the waves playing with the symmetries of the whole structure.
16:30 - 16:45 - Experimental validation of maximal Willis coupling in an acoustic meta-atom Oral [Show abstract]
  • Anton Melnikov, Fraunhofer Institute for Photonic Microsystems (IPMS), Germany
  • Yan Kei Chiang, University of New South Wales, Canberra, Australia
  • Li Quan, The University of Texas at Austin, USA
  • Sebastian Oberst, University of Technology, Sydney, Australia
  • Andrea Alù, Advanced Science Research Center, City University of New York, USA
  • Steffen Marburg, Technical University of Munich, Germany
  • David Powell, University of New South Wales, Canberra, Australia
Willis coupling is the acoustic analog of bianisotropy, representing coupling between the monopolar and dipolar degrees of freedom. It has recently been theoretically demonstrated that there is an upper bound on the strength of this coupling, imposed by the conservation of energy. Here we present a scalable meta-atom design, and experimentally demonstrate that it approaches the theoretical limit for Willis coupling.
16:45 - 17:00 - Binary Gas Concentration Sensing Using Acoustic Mach-Zehnder Interferometer Based On Acoustic Spoof Surface Waves Oral [Show abstract]
  • Norbert Cselyuszka, BioSense Institute, Serbia
  • Andrea Alu, Photonics Initiative, Advanced Science Research Center, City University of New York, USA
  • Nikolina Jankovic, BioSense Institute, Serbia
Acoustic spoof surface waves are supported at the interface between a fluid and a corrugated rigid plate, and their dispersion is very sensitive to minute changes in the fluid parameters. Relying on this distinct feature, we design and numerically analyze the acoustic analogue of a Mach-Zehnder interferometer based on acoustic spoof surface waves, and demonstrate its potential for sensing of binary gas mixtures. The design procedure of the Mach-Zehnder gas sensor is presented, together with the structure response for different concentration of carbon monoxide in CO/air mixture, confirming the high sensitivity of the proposed structure.
17:00 - 17:15 - All-electric Imaging of Inductance-loaded Tunable Piezoelectric Phononic Plates Oral [Show abstract]
  • Feriel-Hiba Chikh-Bled, University of Le Havresity, France
  • Rebecca Sainidou, University of Le Havre, France
  • Pascal Rembert, University of Le Havre, France
  • Bruno Morvan, University of Le Havre, France
<p> We study experimentally the frequency response of a one-dimensional piezoelectric phononic crystal plate, structured on both surfaces with thin millimeter-scaled metallic strips, on which electric-inductance loads are applied. All-electric measurements, in good agreement with finite-element calculations, reveal strong coupling of the electric-resonant modes with Lamb-like guided waves propagating in the plate, leading to opening of large avoided-crossing gaps that become tunable through the external choice of the electric circuit characteristics.</p>
17:15 - 17:30 - A Numerical Method for Computing the Scattering Matrix by the Boundary Element Method with Applications to Phononic Band Analysis Oral [Show abstract]
  • Kei Matsushima, Nagoya University, Japan
  • Hiroshi Isakari, Nagoya University, Japan
  • Toru Takahashi, Nagoya University, Japan
  • Toshiro Matsumoto, Nagoya University, Japan
This paper presents a numerical method for computing scattering matrices of periodic elastic structures using the boundary element method with periodic Green's function. We demonstrate a numerical example of a phononic band calculation as an application of the S-matrix and confirm the effectiveness of our proposed method.
17:30 - 18:00 - Deep Sub-wavelength Metamaterials for Sound Absorption for the Reflection and Ventilation Problems Invited oral [Show abstract]
  • Vicente Romero García, LAUM - UMR 6613 CNRS, France
  • Noé Jiménez, Universitat Politècnica de València, Spain
  • Jean Philippe Groby, LAUM - UMR 6613 CNRS, France
  • Vincent Pagneux, LAUM - UMR 6613 CNRS, France
<p> Acoustic absorbers developed up to now are efficient in the high frequency range with sizes comparable to the wavelength of the frequency to be absorbed. In this talk we discuss acoustic metamaterials based on slow sound and critical coupling conditions showing efficient absorption at low frequencies with deep subwavelength dimensions.</p>
16:00 - Optical metamaterials (part 3)

Session chairperson(s): Nader Engheta

16:00 - 16:30 - Generating high performance, topologically-complex metasurfaces with neural networks Invited oral [Show abstract]
  • Jiaqi Jiang, Stanford University, USA
  • David Sell, Stanford University, United States
  • Stephan Hoyer, Google AI Applied Science, USA
  • Jason Hickey, Google AI Applied Science, USA
  • Jianji Yang, Stanford University, USA
  • Jonathan Fan, Stanford University, USA
We show that generative neural networks, combined with topology optimization, are a computationally efficient route to producing high efficiency, topologically-complex metasurfaces across a broad operating parameter space.
16:30 - 17:00 - Interaction of quantum states of light with metasurfaces Invited oral [Show abstract]
  • Andrey Sukhorukov, Australian National University, Australia
We present theoretical and experimental results demonstrating that non-classical multi-photon interferences can be achieved at the subwavelength scale in all-dielectric metasurfaces, and outline new opportunities for ultra-thin quantum imaging metadevices compatible with single-photon sensitive cameras for the manipulation and measurement of multi-photon quantum states for free-space quantum imaging and communication applications.
17:00 - 17:15 - Optical Knot Metasurfaces Oral [Show abstract]
  • Xiangdong Zhang, Beijing Institute of Technology, China, China
  • Lei Wang, Beijing Institute of Technology, China
  • Weixuan Zhang, Beijing Institute of Technology, China
  • Hongxing Yin, Beijing Institute of Technology, China
We propose and demonstrate experimentally for the first time that the optical vortex knot can be effectively generated by our designed metasurface device. The size of created optical vortex knot using such a device can be six orders of magnitude smaller than those produced by spatial light modulators.
17:15 - 17:30 - Highly Efficient All-dielectric Metasurfaces for Airy Beam Generation No show [Show abstract]
  • Hammad Ahmed, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Pakistan
  • Arbab Abdur Rahim, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Pakistan
  • Nasir Mahmood, The University of Lahore, Pakistan
  • Muhammad Mahmood Ali, University of Limerick, Ireland
  • Husnul Maab, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Pakistan
  • Muhammad Qasim Mahmood, Information Technology University of the Punjab, Pakistan
<p> A highly efficient all-dielectric metasurface based Airy beam generation via simultaneous amplitude and phase modulation of the transmitted wave by controlling the rotation angle of silicon nanorods.</p>
17:30 - 18:00 - Metamaterials for Generating Space-Time Coupled Few-Cycle Pulses Extended oral [Show abstract]
  • Apostolos Zdagkas, University of Southampton, United Kingdom
  • Huifang Zhang, University of Southampton, United Kingdom
  • Tanchao Pu, University of Southampton, United Kingdom
  • Vassili Savinov, University of Southampton, United Kingdom
  • Nikitas Papasimakis, University of Southampton, United Kingdom
  • Nikolay Zheludev, University of Southampton, United Kingdom
<p> Flying Doughnuts are exact propagating solutions of Maxwell equations in the form of single-cycle, space-time non-separable pulses with complex topology of spectrally broadband vortices. We present the experimental generation of Flying Doughnut pulses and discuss their topological and spatiotemporal structure.</p>
18:00 - 18:30 - Closing ceremony

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