High-Q resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces

The realization of high-Q resonances in a silicon metasurface with various broken-symmetry blocks is reported. Theoretical analysis reveals that the sharp resonances in the metasurfaces originate from symmetry-protected bound in the continuum (BIC) and the magnetic dipole dominates these peculiar st...

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Autores principales:	Cizhe Fang, Qiyu Yang, Qingchen Yuan, Xuetao Gan, Jianlin Zhao, Yao Shao, Yan Liu, Genquan Han, Yue Hao
Formato:	article
Lenguaje:	EN
Publicado:	Institue of Optics and Electronics, Chinese Academy of Sciences 2021
Materias:	all-dielectric metasurface bound states in the continuum optical nonlinearity topological configuration Optics. Light QC350-467
Acceso en línea:	https://doaj.org/article/09886b026a464c0cbede9debdd999203
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spelling	oai:doaj.org-article:09886b026a464c0cbede9debdd9992032021-11-17T07:52:56ZHigh-Q resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces2096-457910.29026/oea.2021.200030https://doaj.org/article/09886b026a464c0cbede9debdd9992032021-06-01T00:00:00Zhttp://www.oejournal.org/article/doi/10.29026/oea.2021.200030https://doaj.org/toc/2096-4579The realization of high-Q resonances in a silicon metasurface with various broken-symmetry blocks is reported. Theoretical analysis reveals that the sharp resonances in the metasurfaces originate from symmetry-protected bound in the continuum (BIC) and the magnetic dipole dominates these peculiar states. A smaller size of the defect in the broken-symmetry block gives rise to the resonance with a larger Q factor. Importantly, this relationship can be tuned by changing the structural parameter, resulting from the modulation of the topological configuration of BICs. Consequently, a Q factor of more than 3,000 can be easily achieved by optimizing dimensions of the nanostructure. At this sharp resonance, the intensity of the third harmonic generation signal in the patterned structure can be 368 times larger than that of the flat silicon film. The proposed strategy and underlying theory can open up new avenues to realize ultrasharp resonances, which may promote the development of the potential meta-devices for nonlinearity, lasing action, and sensing.Cizhe FangQiyu YangQingchen YuanXuetao GanJianlin ZhaoYao ShaoYan LiuGenquan HanYue HaoInstitue of Optics and Electronics, Chinese Academy of Sciencesarticleall-dielectric metasurfacebound states in the continuumoptical nonlinearitytopological configurationOptics. LightQC350-467ENOpto-Electronic Advances, Vol 4, Iss 6, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	all-dielectric metasurface bound states in the continuum optical nonlinearity topological configuration Optics. Light QC350-467
spellingShingle	all-dielectric metasurface bound states in the continuum optical nonlinearity topological configuration Optics. Light QC350-467 Cizhe Fang Qiyu Yang Qingchen Yuan Xuetao Gan Jianlin Zhao Yao Shao Yan Liu Genquan Han Yue Hao High-Q resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces
description	The realization of high-Q resonances in a silicon metasurface with various broken-symmetry blocks is reported. Theoretical analysis reveals that the sharp resonances in the metasurfaces originate from symmetry-protected bound in the continuum (BIC) and the magnetic dipole dominates these peculiar states. A smaller size of the defect in the broken-symmetry block gives rise to the resonance with a larger Q factor. Importantly, this relationship can be tuned by changing the structural parameter, resulting from the modulation of the topological configuration of BICs. Consequently, a Q factor of more than 3,000 can be easily achieved by optimizing dimensions of the nanostructure. At this sharp resonance, the intensity of the third harmonic generation signal in the patterned structure can be 368 times larger than that of the flat silicon film. The proposed strategy and underlying theory can open up new avenues to realize ultrasharp resonances, which may promote the development of the potential meta-devices for nonlinearity, lasing action, and sensing.
format	article
author	Cizhe Fang Qiyu Yang Qingchen Yuan Xuetao Gan Jianlin Zhao Yao Shao Yan Liu Genquan Han Yue Hao
author_facet	Cizhe Fang Qiyu Yang Qingchen Yuan Xuetao Gan Jianlin Zhao Yao Shao Yan Liu Genquan Han Yue Hao
author_sort	Cizhe Fang
title	High-Q resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces
title_short	High-Q resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces
title_full	High-Q resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces
title_fullStr	High-Q resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces
title_full_unstemmed	High-Q resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces
title_sort	high-q resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces
publisher	Institue of Optics and Electronics, Chinese Academy of Sciences
publishDate	2021
url	https://doaj.org/article/09886b026a464c0cbede9debdd999203
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High-Q resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces

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