The generation of a bulk wave due to the nonlinear interaction of surface acoustic waves transmitted in opposite directions is analyzed. We prepared a ZnO thin-film transducer in the rear side of a 131° Y-X LiNbO3 delay line and succeeded in detecting the bulk wave directly. A good agreement was obtained between theory and experiment with respect to the efficiency of generation.
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Nakagawa et al. (1978) studied this question.
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