Optical measurement and numerical analysis of SAW propagation at dispersive delay line on Y-Z LiNbO/sub 3/ substrate
Optical measurement and numerical analysis of SAW propagation at dispersive delay line on Y-Z LiNbO/sub 3/ substrate
复制标题
Y-Z LiNbO/sub 3/ 基板上色散延迟线声表面波传播的光学测量和数值分析
DOI：
10.1109/ultsym.2003.1293242
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
T. Chiba
中科院分区：
文献类型：
--
作者：
T. Chiba
用光外差干涉仪测量了Y-Z LiNbO/sub 3/衬底上斜啁啾色散延迟线的振幅分布。结果表明，在叉指换能器和母线之间的边界产生了相当强的波，并成为频率特性中的涟漪的原因之一。此外，由板条啁啾叉指换能器激发的表面波的衍射清楚地显示了前后方向之间的相当大的不对称性。根据抛物近似理论进行了模拟，并将结果与光学测量结果进行了比较。当由G. Kovacs等人或J. Kushibiki等人的方法进行了数值模拟，模拟结果与实验结果吻合较好。
Acoustic amplitude profiles of a dispersive delay line with a slanted chirp IDT on a Y-Z LiNbO/sub 3/ substrate are measured by an optical heterodyne interferometer. The results reveal that considerably strong waves arise from the boundary between the IDT and the bus bar, and become one of the causes of ripple in the frequency characteristics. Furthermore diffraction of the surface wave excited by the slated chirp IDT clearly shows considerable asymmetry between the front and rear directions. Simulations are performed on the basis of parabolic approximation theory and the results are compared with the optical measurements. When the anisotropy parameter calculated from the material constants of G. Kovacs et al. or J. Kushibiki et al. is used, the simulation results show good agreement with the experimental results.