基于二维声子晶体第一带边态的声学定向辐射  

Acoustic directional radiation based on the first band-edge states of two-dimensional phononic crystals

作　　者：申风富[1] 吴利华[1] 邓科[1] 赵鹤平[1] 

机构地区：[1]吉首大学物理学院,吉首416000

出　　处：《应用声学》2012年第1期75-78,共4页Journal of Applied Acoustics

基　　金：国家自然科学基金资助项目(No.11104113);湖南省自然科学基金资助项目(No.09JJ6011);湖南省高等学校科研基金资助项目(No.08A055;No.11C1057)

摘　　要：采用多重散射方法研究二维四方钢/水声子晶体中线源的辐射问题。数值结果表明利用声子晶体ΓΜ方向的第一带边态可以实现声定向辐射。利用文中设计的三角形晶体结构既可以实现声波的单束定向辐射,还能够得到传播方向互相垂直的双束定向辐射。该研究对声子晶体功能器件的设计具有一定的意义。A multiple scattering method is applied to study the radiation of a line acoustic source placed inside a two-dimensional steel/water phononic crystal of square lattice.Numerical results show that it is possible to realize the acoustic directivity using the first band-edge states in the ΓΜ direction of the crystal.Using the triangular crystal structures designed in this paper,we realize a single-beam directional radiation as well as a dual-beam one with perpendicular directions.This research affords benefits for the designing of acoustic devices of phononic crystals.

关 键 词：声子晶体 声波定向辐射 三角晶体结构 

分 类 号：O735[理学—晶体学]