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

A. C. Hladky-Hennion, J. O. Vasseur, G. Haw, C. Croënne, L. Haumesser, A. N. Norris

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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.

Original languageEnglish (US)
Article number144103
JournalApplied Physics Letters
Issue number14
StatePublished - Apr 8 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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