| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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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** |
1School of Physics and Innovation Institute, Huazhong University of Science and Technology, Wuhan 430074
2Institute of Acoustics, School of Physics Science and Engineering, Tongji University, Shanghai 200092
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| Cite this article: |
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Shu-Huan Xie, Xinsheng Fang, Peng-Qi Li et al 2020 Chin. Phys. Lett. 37 054301 |
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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.
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Received: 09 February 2020
Published: 25 April 2020
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| PACS: |
43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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43.20.+g
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(General linear acoustics)
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43.40.+s
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(Structural acoustics and vibration)
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Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11674346, 11704284, 11690030, and 11690032). Xue-Feng Zhu and Shu-Huan Xie were supported by the Bird Nest Plan of HUST.
?Shu-Huan Xie and Xinsheng Fang contributed equally to this work. |
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