Shear horizontal waves in layered structure with 180° ferroelectric domain

Abstract

Theoretical analyses and numerical results describing the propagation characteristics of shear horizontal interface waves in layered structure with 180° ferroelectric domain are presented. A sandwich structure and a multilayered structure with finite layers are considered. It is found that there exist universally strong dispersion and multimode in a multilayered structure. There are N−1 dispersion curves in a structure with N 180° domain layers. For the multimode, some symmetry properties are found. The fundamental mode is a symmetrical one and the higher-order modes are symmetry or antisymmetry. The multimodes are arranged as symmetrical–antisymmetrical alternatively. There exist cutoff frequencies. It is noted that the B–G wave and the M–T wave may be obtained as special cases of the present theory. Three kinds of dispersion curves are found: ferroelectric domain layer wave, ferroelectric domain layer flexure wave, and lovelike wave. The dispersion relations and the multimode characteristics of the SH interface waves in 180° domain finite multilayered structure were verified by experiments. [Work supported by NNSF.]