Wave-front images of acoustic waves in the (100) and (001) surfaces of TeO2

摘要

Based on the finite-difference time-domain (FDTD) method, we study theoretically the wave-front images ofacoustic waves propagating on the (100) and (001) surface of a highly anisotropic tetragonal TeO2 crystal forwhich imaging experiments have recently been conducted. The theoretical images well reproduce characteristicfeatures observed experimentally. The group-velocity calculations of both surface and pseudosurface acousticwaves account for the shapes and locations of the major wave fronts obtained with the FDTD method.Additional weak wave-front structures that disappear rather quickly in time are attributed to bulk acousticwaves.