Theoretical requirements and inverse design for broadband perfect absorption of low-frequency waterborne sound by ultrathin metasurface

Abstract Effective absorption of low-frequency waterborne sound with subwavelength absorbers has always been a challenging work. In this paper, we derive two theoretical requirements for broadband perfect absorption of low-frequency waterborne sound by ultrathin acoustic metasurface under a finite-t...

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Autores principales:	Jie Zhong, Honggang Zhao, Haibin Yang, Yang Wang, Jianfei Yin, Jihong Wen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0175b3c7d99d4beb9382b6248b086eee
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spelling	oai:doaj.org-article:0175b3c7d99d4beb9382b6248b086eee2021-12-02T16:08:27ZTheoretical requirements and inverse design for broadband perfect absorption of low-frequency waterborne sound by ultrathin metasurface10.1038/s41598-018-37510-w2045-2322https://doaj.org/article/0175b3c7d99d4beb9382b6248b086eee2019-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-37510-whttps://doaj.org/toc/2045-2322Abstract Effective absorption of low-frequency waterborne sound with subwavelength absorbers has always been a challenging work. In this paper, we derive two theoretical requirements for broadband perfect absorption of low-frequency waterborne sound by ultrathin acoustic metasurface under a finite-thickness steel plate followed by semi-infinite air. Based on the theoretical requirements, an acoustic metasurface, a rubber layer embedded periodically with cavities, is inversely designed to achieve perfect absorption at 500 Hz. The metasurface is as thin as 1% of the working wavelength and maintains a substantially high absorptance over a relatively broad bandwidth. The perfect absorption peak is attributed to the overall resonance mode of the metasurface/steel plate system. Besides, high absorption can still be achieved even if the loss factor of the given rubber material cannot meet the ideal requirement. Finally, a strategy to utilize the inherent frequency-dependent characteristics of dynamic parameters of rubber material is suggested to achieve an ultra-broadband perfect absorption. When the frequency-dependent characteristics of the given rubber matrix cannot meet the theoretical requirements, a broadband super-absorption can still be realized by properly designing the frequency position of perfect absorption of the cavity-based metasurface.Jie ZhongHonggang ZhaoHaibin YangYang WangJianfei YinJihong WenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-11 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jie Zhong Honggang Zhao Haibin Yang Yang Wang Jianfei Yin Jihong Wen Theoretical requirements and inverse design for broadband perfect absorption of low-frequency waterborne sound by ultrathin metasurface
description	Abstract Effective absorption of low-frequency waterborne sound with subwavelength absorbers has always been a challenging work. In this paper, we derive two theoretical requirements for broadband perfect absorption of low-frequency waterborne sound by ultrathin acoustic metasurface under a finite-thickness steel plate followed by semi-infinite air. Based on the theoretical requirements, an acoustic metasurface, a rubber layer embedded periodically with cavities, is inversely designed to achieve perfect absorption at 500 Hz. The metasurface is as thin as 1% of the working wavelength and maintains a substantially high absorptance over a relatively broad bandwidth. The perfect absorption peak is attributed to the overall resonance mode of the metasurface/steel plate system. Besides, high absorption can still be achieved even if the loss factor of the given rubber material cannot meet the ideal requirement. Finally, a strategy to utilize the inherent frequency-dependent characteristics of dynamic parameters of rubber material is suggested to achieve an ultra-broadband perfect absorption. When the frequency-dependent characteristics of the given rubber matrix cannot meet the theoretical requirements, a broadband super-absorption can still be realized by properly designing the frequency position of perfect absorption of the cavity-based metasurface.
format	article
author	Jie Zhong Honggang Zhao Haibin Yang Yang Wang Jianfei Yin Jihong Wen
author_facet	Jie Zhong Honggang Zhao Haibin Yang Yang Wang Jianfei Yin Jihong Wen
author_sort	Jie Zhong
title	Theoretical requirements and inverse design for broadband perfect absorption of low-frequency waterborne sound by ultrathin metasurface
title_short	Theoretical requirements and inverse design for broadband perfect absorption of low-frequency waterborne sound by ultrathin metasurface
title_full	Theoretical requirements and inverse design for broadband perfect absorption of low-frequency waterborne sound by ultrathin metasurface
title_fullStr	Theoretical requirements and inverse design for broadband perfect absorption of low-frequency waterborne sound by ultrathin metasurface
title_full_unstemmed	Theoretical requirements and inverse design for broadband perfect absorption of low-frequency waterborne sound by ultrathin metasurface
title_sort	theoretical requirements and inverse design for broadband perfect absorption of low-frequency waterborne sound by ultrathin metasurface
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/0175b3c7d99d4beb9382b6248b086eee
work_keys_str_mv	AT jiezhong theoreticalrequirementsandinversedesignforbroadbandperfectabsorptionoflowfrequencywaterbornesoundbyultrathinmetasurface AT honggangzhao theoreticalrequirementsandinversedesignforbroadbandperfectabsorptionoflowfrequencywaterbornesoundbyultrathinmetasurface AT haibinyang theoreticalrequirementsandinversedesignforbroadbandperfectabsorptionoflowfrequencywaterbornesoundbyultrathinmetasurface AT yangwang theoreticalrequirementsandinversedesignforbroadbandperfectabsorptionoflowfrequencywaterbornesoundbyultrathinmetasurface AT jianfeiyin theoreticalrequirementsandinversedesignforbroadbandperfectabsorptionoflowfrequencywaterbornesoundbyultrathinmetasurface AT jihongwen theoreticalrequirementsandinversedesignforbroadbandperfectabsorptionoflowfrequencywaterbornesoundbyultrathinmetasurface
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Theoretical requirements and inverse design for broadband perfect absorption of low-frequency waterborne sound by ultrathin metasurface

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