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《Journal of Synthetic Crystals》 2006-06
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Sonic Waveguide Characteristics of Heterostructures Line Defect of in 2D Phononic Crystal

ZHAO Yan-cheng,ZHAO Fang,YUAN Li-bo(School of Science,Harbin Engineering University,Harbin 150001,China)  
The effect of filling fraction and rotation of line defect acting on the sonic waveguide,which is composed of 2-D aluminium cylinders/air square lattice with square cylinder line defect,has been studied with the plane-wave and super cell method.The mode field distribution of the heterogeneity line defect has been discussed.The result indicates that the defect band is only in the range of-45°θ45° and its position changes with the rotational angle when f=0.7,f_d=0.5 and scattering cylinder rotates.The number of the defect band in the gap decreases with the increase of f_d and the rotation of the heterogeneity line defect does no effect on the sonic waveguide when f_d is very small.The mode field distribution of defect state is decided by its position in the gap and the distance between the up and below sides of the gaps.
【Fund】： 教育部第三届高校优秀青年教师教学科研奖励计划项目资助
【CateGory Index】： O735
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