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1 April 2016 Anomalous refraction of guided waves via embedded acoustic metasurfaces
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We illustrate the design of acoustic metasurfaces based on geometric tapers and embedded in thin-plate structures. The metasurface is an engineered discontinuity that enables anomalous refraction of guided wave modes according to the Generalized Snell’s Law. Locally-resonant geometric torus-like tapers are designed in order to achieve metasurfaces having discrete phase-shift profiles that enable a high level of control of refraction of the wavefronts. Results of numerical simulations show that anomalous refraction can be achieved on transmitted anti-symmetric modes (A0) either when using a symmetric (S0) or anti-symmetric (A0) incident wave, where the former case clearly involves mode conversion mechanisms.
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Hongfei Zhu and Fabio Semperlotti "Anomalous refraction of guided waves via embedded acoustic metasurfaces", Proc. SPIE 9805, Health Monitoring of Structural and Biological Systems 2016, 98051F (1 April 2016);

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