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Communication dans un congrès Année : 2014

Silicon pillars as resonators in an acoustical metamaterial

Résumé

We have investigated the propagation of Lamb waves in structures made of either an isolated resonant pillar or a set of pillars arranged in a line on a thin plate. The resonators as well as the plate are made of silicon. FEM computations show that two bending modes and one compressional mode are unambiguously identified in the frequency range of interest (0-10 MHz). We used a laser ultrasonic technique to map both the amplitude and the phase of the normal displacements on top of the pillars and at the surface of the sample. When the frequency is tuned to a resonant mode, either compressional or bending, the pillars vibrate 180° out-of-phase with respect to the Lamb waves, resulting in a negative modulus or negative mass density respectively.
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Dates et versions

hal-03508193, version 1 (03-01-2022)

Identifiants

Citer

B. Bonello, R. Marchal, R. Moiseyenko, Yan Pennec, Bahram Djafari-Rouhani, et al.. Silicon pillars as resonators in an acoustical metamaterial. ASME 2014 International Mechanical Engineering Congress and Exposition, IMECE 2014, Nov 2014, Montreal, Canada. ⟨10.1115/IMECE2014-37914⟩. ⟨hal-03508193⟩
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Dernière date de mise à jour le 26/06/2024
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