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Electromagnetic interactions
14:00 Invited talk: Coupling Between Surface Acoustic Waves and Localized Plasmons in Pillared Phononic Crystals
Bahram Djafari Rouhani (1), Noual Adnane (2), Rock Akiki (1), Yan Pennec (1), El Houssaine El Boudouti (2)
(1)University of Lille (France) , (2)Université Mohamed Premier (Morocco)
We present a theoretical study of the interaction between surface (Sezawa) acoustic waves propagating at the surface of a multilayer structure supporting Au pillars with the metal-insulator-metal (MIM) type plasmons localized between each pillar and a Au film underneath. The strength of the coupling is evaluated from the modulation of plasmonic properties by the acoustic waves. The highest coupling rates are obtained for a compressional mode of the pillars and for some of the propagating Sezawa modes.
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Andrea Perucchi
Elettra - Sincrotrone Trieste (Italy)
The THz fields are used to achieve THz control of matter and to push materials well into their nonlinear regime. THz nonlinearities are particularly pronounced in Dirac materials, because of their non-conventional band-structure properties. We report here on the THz nonlinear electrodynamics of the topological insulator Bi2Se3 and on layered black phosphorus, thus highlighting the role of band dispersion in shaping the nonlinear properties.
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Mario Lucido
University of Cassino and Southern Lazio (Italy)
In this paper, the analysis of the scattering from a thin disk is formulated as a set of one-dimensional integral equations in the vector Hankel transform domain. Galerkin method with a complete set of orthogonal eigenfunctions of the static part of the integral operator, reconstructing the physical behavior of the fields, as expansion basis, leads to fast converging Fredholm second-kind matrix equations.
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Mircea Giloan
Babes-Bolyai University (Romania)
The reflection and transmission phenomena occurring at the plane interface between two transformation-optics media are analyzed. In order to compute the reflection and transmission coefficients the wave vectors and the polarizations of the incident, reflected and transmitted waves are described inside the anisotropic and inhomogeneous media at the interface plane. The reflection and transmission coefficients are derived in terms of the coordinate transformations which are describing the transformation-optics media.
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Garima Joshi, R. Vijaya
Indian Institute of Technology (India)
We have proposed a THz range, multi-band, metasurface-integrated Fabry- Perot cavity antenna. The perforated single layer metasurface provides 40% wide stop bandwidth and it is used as superstrate. The metasurface integrated antenna resonates at the frequencies of 180.0 GHz, 189.46 GHz, 199.02 GHz and 208.82 GHz. The maximum peak gain of 13 dBi is at 189.46 GHz among the four bands. Nearly 5% of gain enhancement is achieved in all four bands after loading the metasurface on the antenna.
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Owen D. Miller
Yale University (USA)
Electromagnetic design problem are generically hard nonlinear problems that are computationally expensive and prone to getting trapped at low-quality optima. We reformulate electromagnetic-design problems as quadratically constrained quadratic programs (QCQPs). In this formulation, Maxwell?s equations are replaced with a set of real- and reactive-power conservation laws, which enable identification of fundamental bounds across geometric, frequency, and configuration degrees of freedom. We show examples of fundamental limits for perfect absorbers, multi-frequency reflectivity sensors, and near-field radiative heat transfer.
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