Manipulating Acoustic Wavefront by Inhomogeneous Impedance and Steerable Extraordinary Reflection

被引：150

作者：

Zhao, Jiajun ^{[1
,2
,3
]}

Li, Baowen ^{[2
,3
,4
]}

Chen, Zhining ^{[1
]}

Qiu, Cheng-Wei ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore

[2] Natl Univ Singapore, Dept Phys, Singapore 117546, Singapore

[3] Natl Univ Singapore, Ctr Computat Sci & Engn, Singapore 117546, Singapore

[4] Tongji Univ, Sch Phys Sci & Engn, Ctr Phonon & Thermal Energy Sci, Shanghai 200092, Peoples R China

来源：

SCIENTIFIC REPORTS | 2013年 / 3卷

关键词：

PHASE DISCONTINUITIES; LIGHT; REFRACTION;

D O I：

10.1038/srep02537

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We unveil the connection between the acoustic impedance along a flat surface and the reflected acoustic wavefront, in order to empower a wide wariety of novel applications in acoustic community. Our designed flat surface can generate double reflections: the ordinary reflection and the extraordinary one whose wavefront is manipulated by the proposed impedance-governed generalized Snell's law of reflection (IGSL). IGSL is based on Green's function and integral equation, instead of Fermat's principle for optical wavefront manipulation. Remarkably, via the adjustment of the designed specific acoustic impedance, extraordinary reflection can be steered for unprecedented acoustic wavefront while that ordinary reflection can be surprisingly switched on or off. The realization of the complex discontinuity of the impedance surface has been proposed using Helmholtz resonators.

引用

页数：6