单元结构尺寸对不锈钢/空气二维声子晶体声波禁带的影响  

The effects of unit dimension on band gaps for two-dimensional square arrays of stainless steel cylinders in air

作　　者：赵宏刚[1] 刘耀宗[1] 温激鸿[1] 韩小云[1] 

机构地区：[1]国防科技大学光子声子晶体研究中心,湖南长沙410073

出　　处：《功能材料》2004年第6期793-795,共3页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)基础研究资助项目(51307)

摘　　要：　使用平面波展开法,讨论了单元结构尺寸对正方形排列的不锈钢/空气二维声子晶体声波禁带的影响。结果表明,当填充率(晶格常数)增大时,最低禁带宽度增大(减小);最低禁带中心频率基本不受散射体半径的影响,但随晶格常数的增大而降低。Using the plane-wave expansion (PWE) method, the influences of unit dimension on band gaps of 2D phononic crystal composed of square arrays of stainless steel cylinders in air were discussed in this paper. Numerical result shows that the width of the lowest band gap increases (decreases) with increasing the filling fraction (lattice constant); The center frequency of the lowest gapwas about independent of the cylinder radius, but gets lower with increasing lattice constant.

关 键 词：禁带宽度 声子晶体 晶格常数 二维 平面波展开 散射体 半径 体声波 单元结构 中心频率 

分 类 号：TH132.46[机械工程—机械制造及自动化] O734[理学—晶体学]