Finite difference time domain analysis of two-dimensional surface acoustic wave piezoelectric phononic crystals at radio frequency  

作　　者：TIAN Yahui LI Honglang KE Yabing LUO Wei WEI Jiangbo HE Shitang 

机构地区：[1]Institute of Acoustics,Chinese Academy of Sciences [2]School of Optical and Electrical Information,Huazhong Univ.of Science & Technology [3]Information-Electric Institute,MESNAC co.,ltd.

出　　处：《Chinese Journal of Acoustics》2015年第3期257-266,共10页声学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(11174318,11304346,61106081);Chinese Postdoctoral Science Foundation(2011M501204,2013T60718);National High Technology Research and Development Program(863 Program)(SS2013AA041103);Beijing Municipal Science and Technology Commission Project(Z141100003814016);the Fundamental Research Funds for the Central Universities(HUST:2013QN038)

摘　　要：The finite-difference time-domain （FDTD） method is proposed for analyzing the surface acoustic wave （SAW） propagation in two-dimensional （2D） piezoelectric phononic crystals （PCs） at radio frequency （RF）, and also experiments are established to demonstrate its analysis result of the PCs＇ band gaps. The FDTD method takes the piezoelectric effect of PCs into account, in which periodic boundary conditions are used to decrease memory/time consumption and the perfectly matched layer boundary conditions are adopted as the SAW absorbers to attenuate artificial reflections. Two SAW delay lines are established with/without piezoelectric PCs located between interdigital transducers. By removing several echoes with window gating function in time domain, delay lines transmission function is achieved. The PCs＇ transmission functions and band gaps are obtained by comparing them in these two delay lines. When Aluminum/128°YX-LiNbO3 is adopted as scatter and substrate material, the PCs＇ band gap is calculated by this FDTD method and COMSOL respectively. Results show that computational results of FDTD agree well with experimental results and are better than that of COMSOL.The finite-difference time-domain （FDTD） method is proposed for analyzing the surface acoustic wave （SAW） propagation in two-dimensional （2D） piezoelectric phononic crystals （PCs） at radio frequency （RF）, and also experiments are established to demonstrate its analysis result of the PCs＇ band gaps. The FDTD method takes the piezoelectric effect of PCs into account, in which periodic boundary conditions are used to decrease memory/time consumption and the perfectly matched layer boundary conditions are adopted as the SAW absorbers to attenuate artificial reflections. Two SAW delay lines are established with/without piezoelectric PCs located between interdigital transducers. By removing several echoes with window gating function in time domain, delay lines transmission function is achieved. The PCs＇ transmission functions and band gaps are obtained by comparing them in these two delay lines. When Aluminum/128°YX-LiNbO3 is adopted as scatter and substrate material, the PCs＇ band gap is calculated by this FDTD method and COMSOL respectively. Results show that computational results of FDTD agree well with experimental results and are better than that of COMSOL.

关 键 词：FDTD Finite difference time domain analysis of two-dimensional surface acoustic wave piezoelectric phononic crystals at radio frequency COMSOL TIME WAVE 

分 类 号：O735[理学—晶体学]