Interface transmittance and interface waves in acoustic Willis media

Acoustics Willis media, known as bianisotropic acoustic media, incorporate additional coupling between pressure and velocity and between momentum and volumetric strain in their constitutive equation. The extra coupling terms have a significant influence on acoustic wave behavior. In this paper, the...

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Bibliographic Details
Published in:Frontiers in physics 2023-03, Vol.11
Main Authors: Qu, Hongfei, Liu, Xiaoning, Zhang, Anfu
Format: Article
Language:English
Subjects:
interface transmittance
interface wave
metamaterial
wave manipulation
Willis medium
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Summary:Acoustics Willis media, known as bianisotropic acoustic media, incorporate additional coupling between pressure and velocity and between momentum and volumetric strain in their constitutive equation. The extra coupling terms have a significant influence on acoustic wave behavior. In this paper, the unusual wave phenomena relevant to interfaces between homogeneous acoustic Willis media are theoretically studied. We show that Willis media offer more flexible control in wave front and energy flow when waves are transmitted through an interface. Different from traditional acoustic fluid, Willis acoustic media support edge and interface waves, for which the existence conditions and corresponding wave features are systematically investigated. The study unveils more possibilities for manipulating acoustic waves and may inspire new functional designs with acoustic Willis metamaterials.
ISSN:2296-424X
2296-424X
DOI:10.3389/fphy.2023.1141129