Publications

Affichage de 1981 à 1990 sur 16058

COMM

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⟩

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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⟩

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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⟩

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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⟩

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Phonon-Plasmon coupling in pillared phononic crystals mediated by surface acoustic waves

A. Noual, Rock Akiki, Gaëtan Lévêque, Yan Pennec, El Houssaine El Boudouti, Bahram Djafari-Rouhani

We study theoretically the phonon-plasmon interaction in a multilayered structure supporting metallic nano-pillars or ridges. The acoustic vibrations of the pillars, excited by means of an incident surface acoustic wave (Sezawa wave), interact with localized plasmons of metal-insulator-metal type.…

12th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META22, Jul 2022, Torremolinos, Spain. ⟨hal-04369307⟩

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Elastic wave propagation along a 1D chain of pillars

Rock Akiki, Laurent Carpentier, Adnane Noual, Bernard Bonello, Bahram Djafari-Rouhani, Yan Pennec

We theoretically investigate with the help of the finite element method the interaction between aluminum pillars erected on top of a silicon substrate in the low frequency range. We investigated the resonant modes of a finite linear chain of N pillars and demonstrate the propagation along the chain…

12th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META22, Jul 2022, Torremolinos, Spain. ⟨hal-04369107⟩

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⟩