Abstract

We proposed a two dimensional structure consisted of a resonant unit stubbed periodically on a phononic crystal plate with finite thickness to investigate the surface acoustic waves (SAWs). Numerical results shown that two types of SAWs, one is the classical Rayleigh SAWs, whereas the other is the scattering SAWs overcoming the limitation that SAWs can only exit below the bulk cone of the substrate, can be found in the structure. Furthermore, the band gaps of the SAWs are obtained, as well as slow modes of the SAWs are also observed in the band gaps of the phononic crystal substrate. It could open the probability to control effectively the propagation of these SAWs. The results should have the impact on the SAWs communications.

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