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Article Dans Une Revue Applied Physics Letters Année : 2013

Negative refraction of acoustic waves using a foam-like metallic structure

Résumé

A phononic crystal (PC) slab made of a single metallic phase is shown, theoretically and experimentally, to display perfect negative index matching and focusing capability when surrounded with water. The proposed PC slab is a centimeter scale hollow metallic foam-like structure in which acoustic energy is mediated via the metal lattice. The negative index property arises from an isolated branch of the dispersion curves corresponding to a mode that can be coupled to incident acoustic waves in surrounding water. This band also intercepts the water sound line at a frequency in the ultrasonic range. The metallic structure is consequently a candidate for the negative refraction of incident longitudinal waves.
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Dates et versions

hal-00809854 , version 1 (26-07-2021)

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Anne-Christine Hladky, Jerome O. Vasseur, G. Haw, Charles Croënne, L. Haumesser, et al.. Negative refraction of acoustic waves using a foam-like metallic structure. Applied Physics Letters, 2013, 102, pp.144103. ⟨10.1063/1.4801642⟩. ⟨hal-00809854⟩
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