Publicaciones

Affichage de 1981 à 1990 sur 16058

COMM

Acoustic waves focusing with elliptic pillars type metasurface

Laurent Carpentier, Yan Pennec, Bahram Djafari-Rouhani

We numerically investigate the focusing properties of an acoustic metasurface consisting of a line of pillars of elliptic shape on a thin plate. We report on the influence of the ellipticity parameter on both monopolar compressional and dipolar bending modes of the pillars. We show that a line of...

12th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META22, Jul 2022, Torremolinos, Spain. ⟨hal-04369116⟩

COMM

Spectral flow of a localized elastic mode

M. Miniaci, F. Allein, R. K Pal

The introduction of structural defects in otherwise periodic media is well known to grant exceptional space control and localization of waves in various physical fields, including elasticity. We theoretically predict and experimentally demonstrate the spectral flow of a localized mode across a bulk...

12th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META22, Jul 2022, Torremolinos, Spain. ⟨hal-04369179⟩

COMM

Biosensor based on Phononic Crystals Supporting Bound States in the Continuum and Fano resonances

I. Quotane, M. Amrani, C. Ghouila-Houri, E. El Boudouti, L. Krutyanskiy, Bogdan Piwakowski, Philippe Pernod, Abdelkrim Talbi, Bahram Djafari-Rouhani

We study a one-dimensional phononic crystal (1D-PC) that provides a new biosensor platform based on bound states in the continuum (BICs) and Fano resonances. The structure consists of a triple solid-liquid-solid layer immersed in water, where epoxy is used as the solid layers and a mixture of water...

12th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META22, Jul 2022, Torremolinos, Spain. ⟨hal-04369163⟩

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Triangular resonators in topological valley photonic crystals

Gaëtan Lévêque, A. Martínez, Yan Pennec

In that work, we investigate numerically photonic topological insulators based on the valley Hall effect. Linear waveguides are coupled to triangular cavities, and a semi-analytical model is used to evidence the relation between a weak back-scattering along light propagation and the shape of the...

12th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META22, Jul 2022, Torremolinos, Spain. ⟨hal-04369166⟩

COMM

Theoretical Polarimetric Channel Characterization of Road Tunnels in Presence of Vehicles at 5.9 GHz

Jose-Maria Molina-Garcia-Pardo, Esteban Egea-Lopez, Martine Lienard, Pierre Degauque

Vehicular communication is a hot topic for developing solutions for automatic guidance, safety-related problems, and end-user applications. The dedicated frequency band in Europe is around 5.9 GHz. Characterization of the communication channel is thus deeply studied especially for the urban and...

2022 26th International Conference on Circuits, Systems, Communications and Computers (CSCC), Jul 2022, Crete, Greece. pp.280-285, ⟨10.1109/CSCC55931.2022.00054⟩. ⟨hal-03997408⟩

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Experimental demonstration of nonreciprocal propagation in a piezoelectric phononic crystal with spatio-temporal modulation of electrical conditions

Sarah Tessier, Charles Croënne, Florian Allein, Jerome O. Vasseur, Bertrand Dubus

This work concerns the experimental study of the propagation of elastic waves in a piezoelectric phononic crystal made of several identical piezoelectric elements separated by thin electrodes. We analyze the effect of spatio-temporal modulation of electrical conditions on wave propagation. The...

12th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META22, Jul 2022, Torremolinos, Spain. ⟨hal-04369232⟩

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Asymmetric Elastic Wave Propagation in Spatiotemporally Modulated Nonlinear Granular Phononic Crystal

Florian Allein, Georgios Theocharis, Nicholas Boechler

We study the propagation of transverse-rotational waves in a granular crystal in which the shear stiffnesses are spatiotemporally modulated by a longitudinal propagating wave. Asymmetric wave propagation is investigated as well as one-way conversion and transmission. The combination of different...

12th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META22, Jul 2022, Torremolinos, Spain. ⟨hal-04369210⟩

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On the application of periodic electrical boundary conditions as a means of achieving tunable RF SAW devices

Ricardo Alcorta Galván, Charles Croënne, Bertrand Dubus, Brigitte Loiseaux, Etienne Eustache, Matthieu Bertrand, Anne-Christine Hladky-Hennion

A single port SAW resonator is designed, due to its simplicity, a method for extracting the reflection coefficient of its mirrors is developed. Through this method, the mirror response as a function of different periodic electrical boundary conditions is studied and tunable Bragg band gaps as well...

12th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META22, Jul 2022, Torremolinos, Spain. ⟨hal-04369192⟩

COMM

Manipulation of sonic waves by a quadruple set of Helmholtz resonators

R. Sabat, Yan Pennec, Gaëtan Lévêque, E. Cochin, D. Torrent, Bahram Djafari-Rouhani

This paper examines the coupling effect between Helmholtz resonators (HRs) on mitigating low-frequency sound, using the finite element model. Previously, we highlighted the physical mechanism behind double coupled HRs, generating two resonance modes, symmetric and antisymmetric. Such coupling...

12th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META22, Jul 2022, Torremolinos, Spain. ⟨hal-04369145⟩

COMM

ROOM: Adversarial Machine Learning Attacks Under Real-Time Constraints

Amira Guesmi, Khaled Khasawneh, Nael Abu-Ghazaleh, Ihsen Alouani

Advances in deep-learning have enabled a wide range of promising applications. However, these systems are vulnerable to adversarial attacks; adversarially crafted pertur-bations to their inputs could cause them to misclassify. Most state-of-the-art adversarial attack generation algorithms focus...

2022 International Joint Conference on Neural Networks (IJCNN), Jul 2022, Padua, Italy. pp.1-10, ⟨10.1109/IJCNN55064.2022.9892437⟩. ⟨hal-03858376⟩