空气声通过锯齿形狭缝平面透镜的聚焦和定向波束效应
Focusing and directional beaming effects of airborne sound through a planar lens with zigzag slits
摘要：
根据惠更斯-菲涅耳原理，设计了一种平面透镜，有效地实现了类点光源与高斯光束在大气环境中的相互转换。该透镜是由一个平面板精心钻一个不均匀的阵列之字形狭缝，狭缝出口作为亚波长大小的二次源进行所需的声音响应。在可听区的实验结果与理论预测吻合得很好。这种紧凑的设备可用于日常生活应用，例如用于医疗和检测目的。
英文摘要：
Based on the Huygens-Fresnel principle we design a planar lens to efficiently realize the interconversion of the point-like source and Gaussian beam in the air ambience. The lens is constructed by a planar plate drilled elaborately with a nonuniform array of zigzag slits, where the slit exits act as subwavelength-sized secondary sources carrying desired sound responses. The experiments operated at audible regime agree well with the theoretical predictions. This compact device could be useful in daily life applications, such as for medical and detection purposes.
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