$Bidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global PT-symmetries$
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Bidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global PT-symmetries

Abstract Negative refraction plays an important role in acoustic wave manipulation and imaging. However, conventional systems based on acoustic metamaterials suffer from the limits induced by loss-related and resolution issues. In this work, a parity-time (PT)-symmetric system is introduced to reali...

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Autores principales:	Jun Lan, Xiaowei Zhang, Liwei Wang, Yun Lai, Xiaozhou Liu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a443b2eb5e9d492e98c7214fc5f364c3
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id	oai:doaj.org-article:a443b2eb5e9d492e98c7214fc5f364c3
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spelling	oai:doaj.org-article:a443b2eb5e9d492e98c7214fc5f364c32021-12-02T16:31:42ZBidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global PT-symmetries10.1038/s41598-020-67793-x2045-2322https://doaj.org/article/a443b2eb5e9d492e98c7214fc5f364c32020-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-67793-xhttps://doaj.org/toc/2045-2322Abstract Negative refraction plays an important role in acoustic wave manipulation and imaging. However, conventional systems based on acoustic metamaterials suffer from the limits induced by loss-related and resolution issues. In this work, a parity-time (PT)-symmetric system is introduced to realize loss-free bidirectional acoustic negative refraction. The system is composed of a pair of locally PT-symmetric multi-layer metasurfaces sandwiching a region of free space, which also forms a global PT symmetry. The property of bidirectional negative refraction, which is rare for general PT-symmetric structures, is related to the coexistence of amplification and absorption in the locally PT-symmetric metasurfaces at their PT-broken phases. Such metasurfaces can freely switch their states between coherent perfect absorber (CPA) and amplifier depending on the direction of incidence. Our results provide a physical mechanism for realizing bidirectional functions in acoustic PT-symmetric systems.Jun LanXiaowei ZhangLiwei WangYun LaiXiaozhou LiuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-9 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jun Lan Xiaowei Zhang Liwei Wang Yun Lai Xiaozhou Liu Bidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global PT-symmetries
description	Abstract Negative refraction plays an important role in acoustic wave manipulation and imaging. However, conventional systems based on acoustic metamaterials suffer from the limits induced by loss-related and resolution issues. In this work, a parity-time (PT)-symmetric system is introduced to realize loss-free bidirectional acoustic negative refraction. The system is composed of a pair of locally PT-symmetric multi-layer metasurfaces sandwiching a region of free space, which also forms a global PT symmetry. The property of bidirectional negative refraction, which is rare for general PT-symmetric structures, is related to the coexistence of amplification and absorption in the locally PT-symmetric metasurfaces at their PT-broken phases. Such metasurfaces can freely switch their states between coherent perfect absorber (CPA) and amplifier depending on the direction of incidence. Our results provide a physical mechanism for realizing bidirectional functions in acoustic PT-symmetric systems.
format	article
author	Jun Lan Xiaowei Zhang Liwei Wang Yun Lai Xiaozhou Liu
author_facet	Jun Lan Xiaowei Zhang Liwei Wang Yun Lai Xiaozhou Liu
author_sort	Jun Lan
title	Bidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global PT-symmetries
title_short	Bidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global PT-symmetries
title_full	Bidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global PT-symmetries
title_fullStr	Bidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global PT-symmetries
title_full_unstemmed	Bidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global PT-symmetries
title_sort	bidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global pt-symmetries
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/a443b2eb5e9d492e98c7214fc5f364c3
work_keys_str_mv	AT junlan bidirectionalacousticnegativerefractionbasedonapairofmetasurfaceswithbothlocalandglobalptsymmetries AT xiaoweizhang bidirectionalacousticnegativerefractionbasedonapairofmetasurfaceswithbothlocalandglobalptsymmetries AT liweiwang bidirectionalacousticnegativerefractionbasedonapairofmetasurfaceswithbothlocalandglobalptsymmetries AT yunlai bidirectionalacousticnegativerefractionbasedonapairofmetasurfaceswithbothlocalandglobalptsymmetries AT xiaozhouliu bidirectionalacousticnegativerefractionbasedonapairofmetasurfaceswithbothlocalandglobalptsymmetries
_version_	1718383891021037568

Bidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global PT-symmetries

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