Highly-anisotropic elements for acoustic pentamode applications

Abstract

Pentamode metamaterials are a class of acoustic metafluids that are characterized by a divergence free modified stress tensor. Such materials have an unconventional anisotropic stiffness and isotropic mass density, which allow themselves to mimic other fluid domains. Here we present a pentamode design formed by an oblique honeycomb lattice and producing customizable anisotropic properties. It is shown that anisotropy in the stiffness can exceed three orders of magnitude, and that it can be realistically tailored for transformation acoustic applications.

7 pages, 7 figures

References in corpus (4)

• Negative-index metamaterial at 780 nm wavelength
• Acoustic cloaking theory
• Acoustic metafluids
• Special transformations for pentamode acoustic cloaking

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• Tailoring one-dimensional layered metamaterials to achieve unidirectional transmission and reflection
• Acoustic Holographic Rendering with Two-dimensional Metamaterial-based Passive Phased Array
• Acoustic response in a a one-dimensional layered pseudo-Hermitian metamaterial containing defects
• Underwater Acoustic Multiplexing Communication by Pentamode Metasurface
• Broadband focusing of underwater sound using a transparent pentamode lens
• Variational Methods for Optimal Multimaterial Composites and Optimal Design