二维声子晶体线缺陷的自准直波分束效应

Splitting of Self-Collimated Acoustic Beams Based on Line Defect in Sonic Crystal

利用二维声子晶体缺陷与自准直模式的耦合,设计2种线缺陷结构,实现自准直声波分束,并采用有限元数值模拟软件对其进行仿真.仿真结果表明,改变线缺陷中散射体的半径和线缺陷的大小,就能够改变反射和透射波束的能量比例,从而实现可控分束,将分束装置串联还可以实现多路可控分束.

Two kinds splitting schemes for self‐collimated acoustic beam are designed based on the cou‐pling between defect modes and self‐collimated modes in sonic crystals .The schemes are verified numeri‐cally by the finite element method .Controllable energy distribution can be achieved in our schemes as the ratio of energy between reflected and transmitted beams can be regulated freely by changing the defect size .By concatenating and expanding the designed structures ,multichannel splitting can also be achieved which can be widely used in the integrated acoustic devices .