Band gaps and the electromechanical coupling coefficient of a surface acoustic wave in a two-dimensional piezoelectric phononic crystal
Band gaps and the electromechanical coupling coefficient of a surface acoustic wave in a two-dimensional piezoelectric phononic crystal
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DOI：
10.1103/physrevb.71.064303
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发表时间：
2005-02
影响因子：
3.7
通讯作者：
Tsung-Tsong Wu;Zin-Chen Hsu;Zi-Gui Huang
中科院分区：
文献类型：
--
作者：
Tsung-Tsong Wu;Zin-Chen Hsu;Zi-Gui Huang
本文分析了各向同性背景材料中由压电圆柱体阵列组成的二维周期结构中体波和面波的声子带结构。基于平面波展开法，导出了该结构体波与表面波色散关系的显式表达式。计算了表面声波在这种结构中传播的带隙和机电耦合系数。讨论了材料、几何各向异性以及填充分数对机电耦合系数的影响，并绘制了一些无声特征。本研究结果可为研究由声子结构组成的表面声波器件提供重要参考。
In this paper we analyze the phononic band structure of bulk and surface waves in a two-dimensional periodic structure consisting of an array of piezoelectric cylinders in an isotropic background material. The explicit formulations of the bulk wave and the surface wave dispersion relations in such a structure are derived based on the plane wave expansion method. The band gaps and the electromechanical coupling coefficients for surface acoustic waves propagating in such a structure are calculated. The influences of material and geometrical anisotropy as well as the filling fraction on the electromechanical coupling coefficients are discussed, and some silent features are drawn. The results of this research may serve as an important reference for studying surface acoustic wave devices consisting of phononic structures.