META 2021, META'12

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Acoustic surface evanescent wave and its associated physical effects
Minghui Lu, Xu Ni, Yan-Feng Chen

Last modified: 2011-12-30

Abstract


We explore acoustic surface evanescent wave (ASEW) that is the acoustic counterpart of spoof surface plasmon polaritons to modify its associated interesting acoustic phenomena. For example, extraordinary acoustic transmission (EAT) and collimation of sound waves are analyzed using microscopic theory of ASEW. Furthermore, ASEW is modulated to influence the EAT effect by coupling the Helmholtz resonance with Fabry–Pérot resonance, which is helpful to adjust the phase of output sound wave without changing the structure thickness and amplify the focusing intensity of a Fresnel zone plate. Therefore ASEW provides a new route to the design and integration of subwavelength acoustic devices.

Keywords


acoustic metamaterials; phononic crystals