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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| Veröffentlicht in: | Scientific reports 2020-08, Vol.10 (1), p.13823-13823, Article 13823 |
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| creator | Long, Houyou Liu, Chen Shao, Chen Cheng, Ying Chen, Kai Qiu, Xiaojun Liu, Xiaojun |
| description | 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. |
| doi_str_mv | 10.1038/s41598-020-70714-7 |
| format | Article |
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>
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.</description><identifier>ISSN: 2045-2322</identifier><identifier>EISSN: 2045-2322</identifier><identifier>DOI: 10.1038/s41598-020-70714-7</identifier><identifier>PMID: 32796874</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>639/766/25 ; 639/766/25/3927 ; Humanities and Social Sciences ; multidisciplinary ; Science ; Science (multidisciplinary) ; Sonar</subject><ispartof>Scientific reports, 2020-08, Vol.10 (1), p.13823-13823, Article 13823</ispartof><rights>The Author(s) 2020</rights><rights>The Author(s) 2020. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c451t-b39fc2707d3b3a115675af51fd364dd5b54a362093e0c6e8215bad20eefa91c73</citedby><cites>FETCH-LOGICAL-c451t-b39fc2707d3b3a115675af51fd364dd5b54a362093e0c6e8215bad20eefa91c73</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC7429509/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC7429509/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,314,727,780,784,864,885,27924,27925,41120,42189,51576,53791,53793</link.rule.ids></links><search><creatorcontrib>Long, Houyou</creatorcontrib><creatorcontrib>Liu, Chen</creatorcontrib><creatorcontrib>Shao, Chen</creatorcontrib><creatorcontrib>Cheng, Ying</creatorcontrib><creatorcontrib>Chen, Kai</creatorcontrib><creatorcontrib>Qiu, Xiaojun</creatorcontrib><creatorcontrib>Liu, Xiaojun</creatorcontrib><title>Subwavelength broadband sound absorber based on a composite metasurface</title><title>Scientific reports</title><addtitle>Sci Rep</addtitle><description>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. 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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
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| subjects | 639/766/25 639/766/25/3927 Humanities and Social Sciences multidisciplinary Science Science (multidisciplinary) Sonar |
| title | Subwavelength broadband sound absorber based on a composite metasurface |
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