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Manipulating Acoustic Wavefront with Metasurface of Inhomogeneous Impedance

  • Jiajun ZhaoEmail author
Chapter
Part of the Springer Theses book series (Springer Theses)

Abstract

This chapter establishes the framework of acoustic wavefront manipulation by resorting to the acoustic metasurface which has specific acoustic impedance (SAI) inhomogeneity and discontinuity, rather than the phase inhomogeneity in terms of wave propagation (Sundar et al., Opt Lett 34(3):374–376, 2009, [1], Yu et al., Science 334(6054):333–337, 2011, [2]). SAI is one of the acoustic properties of materials, which is comparably more possible to be controllable in reality than propagation phase. More specifically, we find out that the inhomogeneous SAI will generally give rise to one ordinary reflection \(p_{ro}\) and one extraordinary reflection \(p_{re}\), i.e., double reflections. Furthermore, the flat inhomogeneous SAI surface is able to switch on or off \(p_{ro}\) without the influence on its direction, but to tweak \(p_{re}\) in the manner of our proposed design principle: impedance-governed generalized Snell’s law of reflection (IGSL) in acoustics.

Keywords

Surface Acoustic Wave Flat Interface Tube Array Double Reflection Specific Acoustic Impedance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Singapore 2016

Authors and Affiliations

  1. 1.Department of Electrical and Computer EngineeringNational University of SingaporeSingaporeSingapore

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