4G-3 Guided Surface Acoustic Waves in Phononic Crystal Waveguides
4G-3 Guided Surface Acoustic Waves in Phononic Crystal Waveguides
复制标题
DOI：
10.1109/ultsym.2006.183
复制
发表时间：
2006-10
期刊：
影响因子：
--
通讯作者：
Jia-Hong Sun;Tsung-Tsong Wu
中科院分区：
文献类型：
--
作者：
Jia-Hong Sun;Tsung-Tsong Wu
本文采用时域有限差分法分析了二维声子波导中声表面波的传播。本文以一种在环氧树脂基体中形成正方形晶格的圆形钢柱声子晶体为例，研究了声子晶体波导。计算了色散关系和位移场，确定了带隙和本征模。结果表明，存在一个完整的带隙的表面波，从而声波波导相应地创建。指出了波导内表面波的本征模，并演示了伪声表面波在直波导内的传播。此外，还报道了具有尖锐弯曲的波导，并提出了改进的设计以增强能量传输
In this paper, we adopt the finite-difference time-domain method to analyze surface acoustic waves propagating in two-dimensional phononic waveguides. A phononic crystal consisting of circular steel cylinders which form a square lattice in an epoxy matrix is considered as an example to study phononic crystal waveguides. The dispersion relation and displacement fields are calculated to identify the band gaps and eigenmodes. The result shows the existence of a complete band gap of surface waves and thus an acoustic waveguide is created accordingly. Eigenmodes of surface waves inside the waveguide are indicated and pseudo surface acoustic waves propagating inside the straight waveguide are demonstrated. Further, the waveguides with a sharp bend are reported and an improved design is suggested to enhance energy transmission