滑行对称波导内的受限声线模式

Confined acoustic line modes within a glide-symmetric waveguide.

作者信息

Moore Daniel B, Ward Gareth P, Smith John D, Hibbins Alastair P, Sambles J Roy, Starkey Timothy A

机构信息

Electromagnetic and Acoustic Materials Group, Department of Physics and Astronomy, University of Exeter, Stocker Road, Devon, EX4 4QL, UK.

DSTL, Porton Down, Salisbury, Wiltshire, SP4 0JQ, UK.

出版信息

Sci Rep. 2022 Jun 29;12(1):10954. doi: 10.1038/s41598-022-13782-1.

DOI:10.1038/s41598-022-13782-1

PMID:35768477

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9243009/

Abstract

Confined coupled acoustic line-modes supported by two parallel lines of periodic holes on opposite surfaces of a glide-symmetric waveguide have a hybrid character combining symmetric and anti-symmetric properties. These hybrid coupled acoustic line-modes have a near constant group velocity over a broad frequency range as no band gap is formed at the first Brillouin zone boundary. We show that the hybrid character of these confined modes is tuneable as a function of the spacing between the two surfaces. Further we explore how the band-gap reappears as the glide symmetry is broken.

摘要

由滑动对称波导相对表面上的两条周期性孔线所支持的受限耦合声线模式具有结合了对称和反对称特性的混合特征。这些混合耦合声线模式在很宽的频率范围内具有近乎恒定的群速度，因为在第一布里渊区边界没有形成带隙。我们表明，这些受限模式的混合特性可作为两个表面之间间距的函数进行调节。此外，我们还探究了随着滑动对称性被打破，带隙是如何重新出现的。