基于二维声子晶体多通道线缺陷结构的定向声激发（英文）  

Directional Acoustic Emission via a Multi-channel Line-defect Waveguide Structure in Two-dimensional Sonic Crystal

作　　者：关珺珺 欧阳仕粮 贾晗[2] 何兆剑[1] 邓科[1] 鲍明[2] 赵鹤平[1] 

机构地区：[1]吉首大学物理与机电工程学院,吉首416000 [2]中国科学院噪声与振动重点实验室,北京100190

出　　处：《人工晶体学报》2016年第6期1611-1618,共8页Journal of Synthetic Crystals

基　　金：National Natural Science Foundation of China(11464012,11304119,11304351,11564012,11564013);Natural Science Foundation of Hunan Province(2016JJ2100);Natural Science Foundation of Education Department of Hunan Province(13A077);Aid Program for Science and Technology Innovative Research Team in Higher Educational Instituions of Hunan Province

摘　　要：提出一种基于声子晶体线缺陷波导的多通道结构来实现声波定向激发。一束入射声波在该结构中传播时被分割成多束分支,这些分支声束到达输出端时具有相等的相位,进而在输出端产生具有高度准直形态的辐射场分布。该辐射场分布的半高宽具有反比于结构中通道数的特点。数值模拟结果与实验结果同时验证了这种结构的声定向效应。相对于大多数已有的声波定向方案,这种结构具有简单从而易于制备的优点。A multi-channel structure based on line-defect waveguide of sonic crystal is proposed to obtain directional acoustic emission. An incident acoustic wave can be split into multiple beams in the structure which then emit at output ports with the same phase,leading to a highly directional radiation pattern. The full width at half maximum（ FWHM） of emission pattern is inversely proportional to the number of channels in the structure. Beaming effect of the designed structure is verified both numerically and experimentally. Compared to most of the existing schemes for acoustic emission,this structure is very simple thus is easier for fabrication.

关 键 词：声子晶体 线缺陷 定向声激发 

分 类 号：O735[理学—晶体学]