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

Abstract : 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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Submitted on : Monday, July 26, 2021 - 10:11:00 PM
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A.C. Hladky, Jérôme Olivier Vasseur, G. Haw, C. Croënne, L. Haumesser, et al.. Negative refraction of acoustic waves using a foam-like metallic structure. Applied Physics Letters, American Institute of Physics, 2013, 102, pp.144103. ⟨10.1063/1.4801642⟩. ⟨hal-00809854⟩



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