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Locally resonant surface acoustic wave band gaps in a two-dimensional phononic crystal of pillars on a surface
Physical Review B
We investigate theoretically the propagation of acoustic waves in a two-dimensional array of cylindrical pillars on the surface of a semi-infinite substrate. Through the computation of the band structure of the periodic array and of the transmission of waves through a finite length array, we show that the phononic crystal can support a number of surface propagating modes in the nonradiative region of the substrate, or sound cone, as limited by the slowest bulk acoustic wave. The modal shape anddoi:10.1103/physrevb.81.214303 fatcat:xmc3hepgzbfyjfl6vrbslba2re