Recently, controlling and manipulating elastic/acoustic waves via artificially structured metamaterials, phononic crystals and metasurfaces have gained an increasing research interest. Unlike others, a metasurface is a single layer in the host medium with an array of subwavelength-scaled patterns introducing an abrupt phase shift in the wave propagating path. In this paper, we explore an elastic metasurface concept to control the propagation of low-frequency flexural Lamb waves. The phase modulation based on the Snell’s law is achieved by tailoring the thickness of thin beam resonators connecting two elastic host medium. Depending on the design of the phase-modulated structure (a.k.a. metasurface), elastic waves can be steered or focused or altered to a non-paraxial beam which is verified through analytical and numerical models.


Elastic Metasurfaces for Low-Frequency Flexural Wavefront Control

Division / Sponsors: 
Design Engineering Division and Computers & Information In Engineering Division


Paper Proceedings: https://asmedigitalcollection.asme.org/IDETC-CIE/IDETC-CIE2020/volume/83907

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