Confined acoustic line modes within a glide-symmetric waveguide

Confined acoustic line modes within a glide-symmetric waveguide

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flashlight 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 Commuter Cup spacing between the two surfaces.Further we explore how the band-gap reappears as the glide symmetry is broken.