Abstract
The phase velocity of the SH-SAW in ZnO/Y-X LiNbO3 structure has been theoretically analyzed. It has been found that the SH-type leaky-SAW turns into an SH-SAW with no attenuation when h/Λ (ZnO film thickness/SAW wavelength) is greater than 0.09. At h/Λ=0.1, the electromechanical coupling factor K2 of the SH-SAW is as high as 21.4%. The collinear interaction between the SH-SAW and the optical waves in the ZnO/Y-X LiNbO3 structure has also been theoretically analyzed. The result shows that both the photo-elastic and electro-optic effects contribute constructively to the acousto-optic interaction. The refractive index change caused by the SH-SAW at h/Λ=0.1, is large near the substrate surface compared with that caused by the Rayleigh wave. The calculated coupling length required to achieve a 100% TE-TM mode conversion using the SH-SAW is smaller than that using the Rayleigh wave.
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