Abstract
The manipulation of refracted wavefronts is eye-catching for owning attractive applications. In this article, an airborne acoustic flat lens for broadband focusing via cross-shape structure was proposed and demonstrated, introducing the broadband manipulation of wavefronts. The designed metasurface employs gradient refractive index cells to redirect the sound wave. Based on our theory, the effective refractive indexes of our unit cells can be easily calculated. The shackle of narrowband metasurfaces is conquered, and applications in medical ultrasound imaging are just around the corner.
Funder
National key R & D program of China
State Key Program of National Natural Science of China
National Natural Science Foundation of China
State Key Laboratory of Acoustics, Chinese Academy of Science
Key Laboratory of Underwater Acoustic Environment, and Chinese Academy of Sciences
Subject
Electrical and Electronic Engineering,Mechanical Engineering,Control and Systems Engineering
Cited by
2 articles.
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