Manipulation of acoustic wavefront by gradient metasurface based on Helmholtz Resonators.
Manipulation of acoustic wavefront by gradient metasurface based on Helmholtz Resonators.
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基于亥姆霍兹谐振器的梯度超表面操纵声波前
DOI:
10.1038/s41598-017-10781-5
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发表时间:
2017-09-06
影响因子:
4.6
通讯作者:
Liu X
中科院分区:
文献类型:
--
作者:
Lan J;Li Y;Xu Y;Liu X
We designed a gradient acoustic metasurface to manipulate acoustic wavefront freely. The broad bandwidth and high efficiency transmission are achieved by the acoustic metasurface which is constructed with a series of unit cells to provide desired discrete acoustic velocity distribution. Each unit cell is composed of a decorated metal plate with four periodically arrayed Helmholtz resonators (HRs) and a single slit. The design employs a gradient velocity to redirect refracted wave and the impedance matching between the metasurface and the background medium can be realized by adjusting the slit width of unit cell. The theoretical and numerical results show that some excellent wavefront manipulations are demonstrated by anomalous refraction, non-diffracting Bessel beam, sub-wavelength flat focusing, and effective tunable acoustic negative refraction. Our designed structure may offer potential applications for the imaging system, beam steering and acoustic lens.
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