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- Title
Manipulating Acoustic Wavefront by Inhomogeneous Impedance and Steerable Extraordinary Reflection.
- Authors
Jiajun Zhao; Baowen Li; Zhining Chen; Cheng-Wei Qiu
- Abstract
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.
- Subjects
ACOUSTIC waveguides; ACOUSTIC wave effects; SOUND waves; INTEGRAL equations; FUNCTIONAL analysis
- Publication
Scientific Reports, 2013, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep02537