Propagation Characteristic in 2D Phononic Crystals with Bending Linear Defect
Propagation Characteristic in 2D Phononic Crystals with Bending Linear Defect
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DOI：
10.4028/www.scientific.net/amm.217-219.2566
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
G. Fan;D. Zhao;Jiao He;Y. Liu
中科院分区：
文献类型：
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作者：
G. Fan;D. Zhao;Jiao He;Y. Liu
用平面波展开法和超晶胞平面波法计算了二维完全声子晶体和缺陷声子晶体的禁带宽度。与完美相比，缺陷的差距将变得更大。随着缺陷长度d的大小变化，能带结构也发生了变化。用MatLab对900个弯曲缺陷声子晶体上的声波传播进行了数值模拟，发现声波只沿缺陷的路径传播。这意味着波是局部化的。因此，声子晶体的缺陷模可以用来作为沿特定路径的声导。
The band gap of 2D perfect and defect phononic crystal are calculated by using plane-wave expansion (PWE) and supercell plane wave method, which is consist of Al2O3 embedded in the epoxy resin with a square arrangement. Compared to the perfect, the gap of defect will become wider. As the size of defect length ld varied, the band structure changed. It is found that the acoustic wave only propagates along the path of defect when the propagation of acoustic wave is simulated on the 900 bending defect phononic crystals by matlab. It means that the waves are localized. So the defect mode of phononic crystal can be used as acoustic waveguide along the specific path.