Broadband, slow sound on a glide-symmetric meander-channel surface

The acoustic surface waves supported by hard surfaces patterned with repeat-period, meandering grooves are explored. The single, continuous groove forms a glide-symmetric surface, inhibiting the formation of a bandgap at the first Brillouin-zone boundary. Consequently, the acoustic surface waves exh...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2019-05, Vol.145 (5), p.3190-3194
Main Authors: Beadle, J. G., Hooper, I. R., Sambles, J. R., Hibbins, A. P.
Format: Article
Language:English
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Summary:The acoustic surface waves supported by hard surfaces patterned with repeat-period, meandering grooves are explored. The single, continuous groove forms a glide-symmetric surface, inhibiting the formation of a bandgap at the first Brillouin-zone boundary. Consequently, the acoustic surface waves exhibit an almost constant, sub-speed-of-sound, group velocity over a broad frequency band. Such slow, broadband modes may have applications in controlling the flow of noise over surfaces.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.5109549