Tunable Double-Band Perfect Absorbers via Acoustic Metasurfaces with Nesting Helical Tracks
Shu-Huan Xie1† , Xinsheng Fang2† , Peng-Qi Li1 , Sibo Huang2 , Yu-Gui Peng1 , Ya-Xi Shen1 , Yong Li2** , Xue-Feng Zhu1**
1 School of Physics and Innovation Institute, Huazhong University of Science and Technology, Wuhan 4300742 Institute of Acoustics, School of Physics Science and Engineering, Tongji University, Shanghai 200092
Abstract ：We propose a design of tunable double-band perfect absorbers based on the resonance absorption in acoustic metasurfaces with nesting helical tracks and deep-subwavelength thicknesses ($ < \lambda /30$ with $\lambda$ being the operation wavelength). By rotating the cover cap with an open aperture on the nesting helical tracks, we can tailor the effective lengths of resonant tubular cavities in the absorber at will, while the absorption peak frequency is flexibly shifted in spectrum and the acoustic impedance is roughly matched with air. The simulated particle velocity fields at different configurations reveal that sound absorption mainly occurs at the open aperture. Our experiment measurements agree well with the theoretical analysis and simulation, demonstrating the wide-spectrum and tunable absorption performance of the designed flat acoustic device.
收稿日期: 2020-02-09
出版日期: 2020-04-25
:
43.35.+d
(Ultrasonics, quantum acoustics, and physical effects of sound)
43.20.+g
(General linear acoustics)
43.40.+s
(Structural acoustics and vibration)
引用本文:
. [J]. 中国物理快报, 2020, 37(5): 54301-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/37/5/054301
或
https://cpl.iphy.ac.cn/CN/Y2020/V37/I5/54301
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2020, Vol. 37 
