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Affichage de 171 à 180 sur 16075

  • Proceedings/Recueil des communications

Non-Destructive Rail Monitoring for Defect Identification

Elissa Akiki, Lynda Chehami, Nikolay Smagin, Emmanuel Moulin, Jamal Assaad, Youssef Zaatar

<div><p>Non-destructive evaluation (NDE) of rail tracks is crucial to ensure the safety and reliability of rail transportation systems. In this work, we present a quantitative study using various signal processing methods to identify defects in rail structures. A diffuse field...

52nd Annual Review of Progress in Quantitative Nondestructive Evaluation, Jul 2025, Montreal (Canada), Canada. 2025. ⟨hal-05241493⟩

  • Communication dans un congrès

Simultaneous Photonic And Phononic Topological Interface States In A Si-based Membrane Crystal

Nouh Krai, Gaëtan Lévêque, Bahram Djafari-Rouhani, Yan Pennec

We investigate the emergence of topological interface states in a silicon-based crystal supporting both photonic and phononic modes. Our results demonstrate that these modes are robust and immune to certain defects, such as bends, ensuring stable wave propagation.

15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META 2025, Jul 2025, Torremolinos, Spain. ⟨hal-05241270⟩

  • Communication dans un congrès

Spectral Frequency Response of Hypersonic Phonons in a Non-Trivial Topological Waveguide

O.R. Ranjbar-Naeini, O. Florez, M.D. Koijam, B. Djafari Rouhani, Y. Pennec, T. Makkonen, O.M.E. Ylivaara, Sara Pourjamal, J. Ahopelto, C.M Sotomayor Torres

The spectral frequency response of a hypersonic phononic wave propagating along a non-trivial topological waveguide is obtained by laser Doppler vibrometry. The guided mode at 2.115 GHz is shown to propagate with minimal loss.

15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META25, Jul 2025, Torremolinos, Spain. ⟨hal-05307572⟩

  • Communication dans un congrès

Topological modes in phononic waveguide interfaces

Koijam Monika Devi, Clivia M Sotomayor‐torres, Yan Pennec, Bahram Djafari-Rouhani

We report phononic waveguide interfaces capable of supporting topological edge modes. We investigate the topological properties of the edge modes in different waveguide interfaces, revealing robust propagation with negligible backscattering. Our results provide valuable insights for the design of...

15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META25, Jul 2025, Torremolinos, Spain. ⟨hal-05307846⟩

  • Communication dans un congrès

Design of underwater noise reduction ultra-thin metabarriers

V.F. Dal Poggetto, M. Miniaci

in this work, we propose a metabarrier with a tailored elastic anisotropy for efficient underwater noise reduction. The constitutive unit cell of the metabarrier is optimized to enhance wave mode coupling to effectively operate in the sub-wavelength regime and also exhibit high sound transmission...

15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META25, Jul 2025, Torremolinos, Spain. ⟨hal-05308523⟩

  • Communication dans un congrès

[Invited] Bio-inspired hierarchical phononic crystals and metamaterials

Marco Miniaci

Marco Miniaci is a permanent researcher at the French National Scientific Research Centre (CNRS) appointed at the Institute of Electronics, Microelectronics and Nanotechnology (IEMN) of Villeneuve D’Ascq, in France. His research interests cover theoretical, numerical, and experimental aspects of...

15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META25, META 2025, Jul 2025, Torremolinos, Spain. ⟨hal-05241240⟩

  • Communication dans un congrès

[Invited] Topological Phase Transitions And Edge States In Ssh-type Elastic Systems With Periodic And Disordered Non-hermitian Modulations

Runcheng Cai, Yabin Jin, Yan Pennec, Xiaoying Zhuang, Bahram Djafari-Rouhani

Based on a generalized Su-Schrieffer-Heeger model, we design a non-Hermitian periodic or disordered elastic platform with feedback control where we theoretically study the topological phase diagrams and edge states. Considering both one and two-dimensional structures, we demonstrate in theory and...

15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META 2025, Jul 2025, Torremolinos, Spain. ⟨hal-05241255⟩

  • Communication dans un congrès

Metamaterial-based Dielectric Elastomers for Enhanced Energy Harvesting

A. Dutta, Y. Pennec, G. Lévêque, B Djafari-Rouhani, M Miniaci

This work investigates the integration of mechanical metamaterials into dielectric elastomer generators (DEGs) to enhance energy harvesting performance. By introducing auxetic and multi-stable geometries in both two-dimensional (2D) and three-dimensional (3D) DEGs, we demonstrate enhanced...

15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META25, Jul 2025, Torremolinos, Spain. ⟨hal-05308556⟩

  • Communication dans un congrès

Luneburg lens for surface water waves

S.M. Kuznetsova, V.F. Dal Poggetto, M. Mazzotti, M. Onorato, V. Pagneux, M. Miniaci

Focusing of surface water waves is investigated using an analog of a Luneburg lens constructed by submerged pillars. Efficient focusing is observed on a wide range of frequencies. The results may find application in the ocean-human interaction, such as coastal protection.

15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META25, Jul 2025, Torremolinos, Spain. ⟨hal-05308500⟩

  • Communication dans un congrès

Optomechanical Su-Schrieffer–Heeger States in a Nanobeam Cavity

Hicham Mangach, Abdellatif Gueddida, Ricardo Alcorta Galvan, Gaëtan Lévêque, Marco Miniaci, Yan Pennec, Bahram Djafari-Rouhani

We design an optomechanical nanobeam cavity based on the Su–Schrieffer–Heeger (SSH) model, created via alternating two mechanical/optical domains at the interface through controlled holes and stubs spacing. The system provides topologically protected photon–phonon coupling (g/2π = 782 KHz) and a...

15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META25, Jul 2025, Torremolinos, Spain. ⟨hal-05306505⟩