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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

physical review. b, condensed matter

Wave-front images of acoustic waves in the (100) and (001) surfaces of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">TeO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Wave-front images of acoustic waves in the (100) and (001) surfaces ofTeO2