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Subwavelength broadband sound absorber based on a composite metasurface

Suppressing broadband low-frequency sound has great scientific and engineering significance. However, normal porous acoustic materials backed by a rigid wall cannot really play its deserved role on low-frequency sound absorption. Here, we demonstrate that an ultrathin sponge coating can achieve high...

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Bibliographic Details
Published in:Scientific reports 2020-08, Vol.10 (1), p.13823-13823, Article 13823
Main Authors: Long, Houyou, Liu, Chen, Shao, Chen, Cheng, Ying, Chen, Kai, Qiu, Xiaojun, Liu, Xiaojun
Format: Article
Language:English
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Summary:Suppressing broadband low-frequency sound has great scientific and engineering significance. However, normal porous acoustic materials backed by a rigid wall cannot really play its deserved role on low-frequency sound absorption. Here, we demonstrate that an ultrathin sponge coating can achieve high-efficiency absorptions if backed by a metasurface with moderate surface impedance. Such a metasurface is constructed in a wide frequency range by integrating three types of coiled space resonators. By coupling an ultrathin sponge coating with the designed metasurface, a deep-subwavelength broadband absorber with high absorptivity ( > 80 % ) exceeding one octave from  185 Hz to  385 Hz (with wavelength λ from 17.7 to 8.5 times of thickness of the absorber) has been demonstrated theoretically and experimentally. The construction mechanism is analyzed via coupled mode theory. The study provides a practical way in constructing broadband low-frequency sound absorber.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-70714-7