Positive, negative, zero refraction, and beam splitting in a solid/air phononic crystal: Theoretical and experimental study
Positive, negative, zero refraction, and beam splitting in a solid/air phononic crystal: Theoretical and experimental study
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DOI：
10.1103/physrevb.79.214305
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发表时间：
2009-06-01
影响因子：
3.7
通讯作者：
Dubus, B.
中科院分区：
文献类型：
--
作者：
Bucay, J.;Roussel, E.;Dubus, B.
我们报告的声子晶体（PC）组成的一个正方形阵列的圆柱形聚氯乙烯夹杂物在空气中表现出积极的，负的，或零折射取决于入射声束的角度。对于所有三种折射情况，透射光束在离开晶体时经历分裂。利用时域有限差分法对这些特性进行了理论分析和实验验证。带结构和等效面（EFSs）计算的平面波展开方法表明，所观察到的属性的结果从独特的几何形状的PC的EFS相比，入射介质。
We report on a phononic crystal (PC) consisting of a square array of cylindrical polyvinylchloride inclusions in air that exhibits positive, negative, or zero refraction depending on the angle of the incident sound beam. For all three cases of refraction, the transmitted beam undergoes splitting upon exiting the crystal. These properties are analyzed theoretically using finite difference time domain method and are demonstrated experimentally. Band structures and equifrequency surfaces (EFSs) calculated with the plane-wave expansion method show that the observed properties result from the unique geometry of the PC's EFS as compared to that of the incident media.