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

Anne-Christine Hladky | Zendy; Jérôme O. Vasseur | Zendy; G. Haw | Zendy; Charles Croënne | Zendy; Lionel Haumesser | Zendy; Andrew N. Norris | Zendy

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

Author(s) -

Anne-Christine Hladky,

Jérôme O. Vasseur,

G. Haw,

Charles Croënne,

Lionel Haumesser,

Andrew N. Norris

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4801642

Subject(s) - slab , materials science , negative refraction , acoustic wave , dispersion (optics) , optics , ultrasonic sensor , acoustic dispersion , metamaterial , refractive index , dispersion relation , acoustics , physics , optoelectronics , geophysics

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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