22 October 2010 Optimum cut direction of lithium niobate as substrate in surface acoustic wave devices
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Abstract
A cut direction, rotated ZY cut of Lithium Niobate (LN), is studied. LN is a good piezoelectric crystal and it can be used as substrate of surface acoustic wave devices. In this paper, surface acoustic wave equations, including basic equations and boundary condition equations, are deduced. According to these equations the surface acoustic wave velocities are systematically calculated using a circle iterative method for LN along different directions in optimum decoupling acoustic sagittal YZ plane. The electromechanical coupling coefficients for rotated ZY cut LN are also calculated. The optimum cut direction of the LN crystal piece as substrate of surface acoustic wave devices is determined by the largest electromechanical coupling coefficient.
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Kuanxin Yu, Tao Liu, "Optimum cut direction of lithium niobate as substrate in surface acoustic wave devices", Proc. SPIE 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, 765827 (22 October 2010); doi: 10.1117/12.866330; https://doi.org/10.1117/12.866330
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