From Event: SPIE Smart Structures + Nondestructive Evaluation, 2019
The manipulation of acoustic wave has broad applications in ultrasonic medical equipment,acoustic detection,noise isolation and many other fields. As a way to control acoustic waves, metasurface is not only small in size, simple to manufacture, but also can control acoustic waves in various patterns with high precision. Up till now, most metasurfaces are fixed structures that can only realize one changeless acoustic wave manipulation purpose. This presentation intends to study a new type of tunable ultrasonic metasurface to control different refraction angles or focus plane waves. According to Snell's formula, the refraction angle of a wave can be controlled by the phase gradient along the interface. Here we design a metasurface, which can manipulate wave in different patterns by simple mechanical movement without external circuits and electromagnets. This presentation demonstrates the feasibility of the design based on theory and finite element simulation, and will provide a novel perspective in the field of acoustic wave control research.
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Zhong Chen, "Convenient tunable metasurface for acoustic wave manipulation (Conference Presentation)," Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 109721A (Presented at SPIE Smart Structures + Nondestructive Evaluation: March 06, 2019; Published: 1 April 2019); https://doi.org/10.1117/12.2514013.6020108916001.