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.

Details

Title
Confined acoustic line modes within a glide-symmetric waveguide
Author
Moore, Daniel B. 1 ; Ward, Gareth P. 1 ; Smith, John D. 2 ; Hibbins, Alastair P. 1 ; Sambles, J. Roy 1 ; Starkey, Timothy A. 1 

 University of Exeter, Electromagnetic and Acoustic Materials Group, Department of Physics and Astronomy, Devon, UK (GRID:grid.8391.3) (ISNI:0000 0004 1936 8024) 
 DSTL, Porton Down, Salisbury, Wiltshire, UK (GRID:grid.417845.b) (ISNI:0000 0004 0376 1104) 
Publication year
2022
Publication date
2022
Publisher
Nature Publishing Group
e-ISSN
20452322
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2682034073
Copyright
© The Author(s) 2022. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.