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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.
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Details
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)
2 DSTL, Porton Down, Salisbury, Wiltshire, UK (GRID:grid.417845.b) (ISNI:0000 0004 0376 1104)