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Maximum Willis Coupling in Acoustic Scatterers.

Li Quan¹, Younes Ra'di¹, Dimitrios L Sounas¹

¹Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.

Physical Review Letters

|July 7, 2018

Summary

This summary is machine-generated.

Researchers derived bounds for Willis coupling in acoustic materials, enabling maximally bianisotropic inclusions. These inclusions can create acoustic metasurfaces for efficient sound manipulation.

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Area of Science:

Acoustic Metamaterials
Wave Phenomena
Elasticity

Background:

Willis coupling describes cross-coupling between strain and velocity in acoustic materials, analogous to bianisotropic effects in electromagnetics.
Previous studies largely treated these phenomena as perturbative.
There is growing interest in exploiting these coupling effects for advanced acoustic applications.

Purpose of the Study:

To derive general bounds on the Willis response of acoustic scatterers.
To demonstrate the practical realization of acoustic inclusions that reach these bounds.
To utilize these inclusions for designing high-efficiency acoustic metasurfaces.

Main Methods:

Derivation of theoretical bounds for Willis coupling parameters.
Design and simulation of acoustic scatterers and inclusions.
Fabrication and characterization of acoustic metasurfaces.

Main Results:

General bounds for the Willis response of acoustic scatterers were established.
A systematic method for designing maximally bianisotropic acoustic inclusions was presented.
Acoustic metasurfaces capable of bending and steering sound with unitary efficiency were realized.

Conclusions:

The derived bounds provide a framework for understanding and designing acoustic materials with strong Willis coupling.
Maximally bianisotropic inclusions offer a pathway to achieve unprecedented control over acoustic wave propagation.
The developed acoustic metasurfaces demonstrate the potential for highly efficient sound manipulation applications.