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Tunable Acoustic Metasurface with High-Q Spectrum Splitting

Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University (NWPU), Xi’an 710129, China
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Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Materials 2018, 11(10), 1976; https://doi.org/10.3390/ma11101976
Received: 10 September 2018 / Revised: 8 October 2018 / Accepted: 10 October 2018 / Published: 14 October 2018
(This article belongs to the Special Issue Metamaterials and Devices)
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Abstract

We propose a tunable acoustic metasurface using a nested structure as the microunit, which is constituted by two distinct resonators. Thanks to the coupling resonance for the microunit and by simply adjusting the rotation angle of the inner split cavity, this nested structure provides nearly 2π phase shift. The full-wave simulations demonstrate that the constructed metasurface can be tuned to reflect incident sound waves to different directions in the operation frequency region with a very narrow bandwidth, which is a key functionality for many applications such as filtering and imaging. Meanwhile, the reflected sound waves out of the operation frequency region always remain unchanged. As a result, a high Q-factor spectrum splitting can be realised. The presented metasurface is of importance to develop many metamaterial-based devices, such as tunable acoustic cloaks and acoustic switching devices. View Full-Text
Keywords: metasurface; tunability; high Q-factor; spectrum splitting metasurface; tunability; high Q-factor; spectrum splitting
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Zhai, S.; Song, K.; Ding, C.; Wang, Y.; Dong, Y.; Zhao, X. Tunable Acoustic Metasurface with High-Q Spectrum Splitting. Materials 2018, 11, 1976.

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