Experimental Realization of Acoustic Bianisotropic Gratings

Steven R. Craig, Xiaoshi Su, Andrew Norris, Chengzhi Shi

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Acoustic bianisotropic materials couple pressure and local particle velocity fields to simultaneously excite monopole and dipole scattering, which results in asymmetric wave transmission and reflection of airborne sound. We systematically realize an arbitrarily given bianisotropic coupling between the pressure and velocity fields for asymmetric wave propagation by an acoustic grating with inversion symmetry breaking. This acoustic bianisotropic grating is designed by optimizing the unit cells with a finite element method to achieve the desired scattering wavevectors determined by the bianisotropic induced asymmetric wave propagation. The symmetry and Bloch wavevectors in the reciprocal space resulting from the grating are analyzed, which match with the desired scattering wavevectors. The designed structures are fabricated for the experimental demonstration of the bianisotropic properties. The measured results match with the desired asymmetric wave scattering fields.

Original languageEnglish (US)
Article number061002
JournalPhysical Review Applied
Volume11
Issue number6
DOIs
StatePublished - Jun 6 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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