Anomalous refraction of guided waves via embedded acoustic metasurfaces

Hongfei Zhu; Fabio Semperlotti

doi:10.1117/12.2218915

1 April 2016 Anomalous refraction of guided waves via embedded acoustic metasurfaces

Hongfei Zhu, Fabio Semperlotti

Proceedings Volume 9805, Health Monitoring of Structural and Biological Systems 2016; 98051F (2016) https://doi.org/10.1117/12.2218915
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2016, Las Vegas, Nevada, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.2218915

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