The asymmetrical transmission characteristics of shear horizontal guided wave in an asymmetricalstructure

Abstract

The cut-off frequency of higher modes of shear horizontal (SH) guided wave propagating in a plate depends on the thickness due to dispersive characteristic. Through numerical simulation of the first higher (SH1) mode of SH guided wave propagation in an asymmetric structure, we have realized sound unidirectional transmission based on breaking spatial inversion symmetry. It demonstrated that when the SH1 mode are launched into the system from the left side, it mostly converts to the fundamental mode in the defected region and attain a high transmission; on the contrary, when the waves are incident from the right side, the conversion is weak, most SH1 mode is reflected and the transmission is low. This asymmetric system should be potentially significant in putting to good use in a variety of applications.