Acoustic metafluids

Details Acoustic metafluids Acoustic metafluids

2008-08-24

arxiv.org/abs/0808.3276v4

J. Acoust. Soc. Am. Volume 125, Issue 2, pp. 839-849 (February 2009)

Physics

Condensed Matter

Materials Science

12 pages, 6 figures

Scientific paper

10.1121/1.3050288

Acoustic metafluids are defined as the class of fluids that allow one domain of fluid to acoustically mimic another, as exemplified by acoustic cloaks. It is shown that the most general class of acoustic metafluids are materials with anisotropic inertia and the elastic properties of what are known as pentamode materials. The derivation uses the notion of finite deformation to define the transformation of one region to another. The main result is found by considering energy density in the original and transformed regions. Properties of acoustic metafluids are discussed, and general conditions are found which ensure that the mapped fluid has isotropic inertia, which potentially opens up the possibility of achieving broadband cloaking.

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