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

This is the final version. Available from Acoustical Society of America via the DOI in this record.All data created during this research are openly available from the University of Exeter’s institutional repository at https://ore.exeter.ac.uk/.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.QinetiQ LtdEngineering and Physical Sciences Research Council (EPSRC)QinetiQ Lt