Acoustic metafluids

Abstract

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.

12 pages, 6 figures

References in corpus (7)

• Hiding Under the Carpet: a New Strategy for Cloaking
• Acoustic cloaking theory
• Full-wave invisibility of active devices at all frequencies
• Transformation Optics and the Geometry of Light
• The impedance-matched reduced acoustic cloaking with realizable mass and its layered design
• Comment on "Scattering Theory Derivation of a 3D Acoustic Cloaking Shell"
• Acoustic cloaking in 2D and 3D using finite mass