The TE⇄TM mode conversion by acoustic surface waves in a ZnO-film optical waveguide fabricated on a fused-quartz substrate is described. An efficient mode conversion as high as 88% has been accomplished in a waveguide with a film thickness of 5 μm at an acoustic frequency of 226 MHz and an acoustic power of 350 mW.
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Sasaki et al. (1974) studied this question.
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