True- and quasi-bound states in the continuum in one-dimensional gratings with broken up-down mirror symmetry

There are many reports in the literature of bound states in the continuum (BICs) in systems with up–down mirror symmetry. Semiconductor-based technology requires bulk semiconductor substrates, which impose symmetry breaking in the vertical direction. In this paper, we explore the possibility of real...

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Autores principales:	Głowadzka Weronika, Wasiak Michał, Czyszanowski Tomasz
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	bound states in the continuum fano resonance microcavities Physics QC1-999
Acceso en línea:	https://doaj.org/article/994b3abc1a6f4de99ae006e1d3466123
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spelling	oai:doaj.org-article:994b3abc1a6f4de99ae006e1d34661232021-12-05T14:10:56ZTrue- and quasi-bound states in the continuum in one-dimensional gratings with broken up-down mirror symmetry2192-861410.1515/nanoph-2021-0319https://doaj.org/article/994b3abc1a6f4de99ae006e1d34661232021-10-01T00:00:00Zhttps://doi.org/10.1515/nanoph-2021-0319https://doaj.org/toc/2192-8614There are many reports in the literature of bound states in the continuum (BICs) in systems with up–down mirror symmetry. Semiconductor-based technology requires bulk semiconductor substrates, which impose symmetry breaking in the vertical direction. In this paper, we explore the possibility of realizing BICs in a high refractive index subwavelength one-dimensional grating placed on a substrate with a refractive index that varies from 1 to almost the refractive index of the grating, while the refractive index above the grating is 1. We demonstrate that in gratings with broken up–down mirror symmetry not only symmetry-protected BICs can arise, but also Friedrich–Wintgen (FW) and interference-based (IB) BICs with diverging quality factors. The limit of the refractive index difference between the grating and the substrate supporting the BIC was found to be as little as 0.03. We also present a study of configurations composed of a finite number of grating stripes, with refractive indices corresponding to GaAs in the grating and Al-rich AlGaAs in the substrate. We demonstrate that such an all-semiconductor configuration enables Q-factors above 104 when composed of fewer than 20 periods and nearly exponential Q-factor growth with increasing numbers of grating periods. The results of this study pave the way for a new class of micro- and nano-optical cavities realised in standard all-semiconductor technology and relying on the high quality factor induced by BIC.Głowadzka WeronikaWasiak MichałCzyszanowski TomaszDe Gruyterarticlebound states in the continuumfano resonancemicrocavitiesPhysicsQC1-999ENNanophotonics, Vol 10, Iss 16, Pp 3979-3993 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bound states in the continuum fano resonance microcavities Physics QC1-999
spellingShingle	bound states in the continuum fano resonance microcavities Physics QC1-999 Głowadzka Weronika Wasiak Michał Czyszanowski Tomasz True- and quasi-bound states in the continuum in one-dimensional gratings with broken up-down mirror symmetry
description	There are many reports in the literature of bound states in the continuum (BICs) in systems with up–down mirror symmetry. Semiconductor-based technology requires bulk semiconductor substrates, which impose symmetry breaking in the vertical direction. In this paper, we explore the possibility of realizing BICs in a high refractive index subwavelength one-dimensional grating placed on a substrate with a refractive index that varies from 1 to almost the refractive index of the grating, while the refractive index above the grating is 1. We demonstrate that in gratings with broken up–down mirror symmetry not only symmetry-protected BICs can arise, but also Friedrich–Wintgen (FW) and interference-based (IB) BICs with diverging quality factors. The limit of the refractive index difference between the grating and the substrate supporting the BIC was found to be as little as 0.03. We also present a study of configurations composed of a finite number of grating stripes, with refractive indices corresponding to GaAs in the grating and Al-rich AlGaAs in the substrate. We demonstrate that such an all-semiconductor configuration enables Q-factors above 104 when composed of fewer than 20 periods and nearly exponential Q-factor growth with increasing numbers of grating periods. The results of this study pave the way for a new class of micro- and nano-optical cavities realised in standard all-semiconductor technology and relying on the high quality factor induced by BIC.
format	article
author	Głowadzka Weronika Wasiak Michał Czyszanowski Tomasz
author_facet	Głowadzka Weronika Wasiak Michał Czyszanowski Tomasz
author_sort	Głowadzka Weronika
title	True- and quasi-bound states in the continuum in one-dimensional gratings with broken up-down mirror symmetry
title_short	True- and quasi-bound states in the continuum in one-dimensional gratings with broken up-down mirror symmetry
title_full	True- and quasi-bound states in the continuum in one-dimensional gratings with broken up-down mirror symmetry
title_fullStr	True- and quasi-bound states in the continuum in one-dimensional gratings with broken up-down mirror symmetry
title_full_unstemmed	True- and quasi-bound states in the continuum in one-dimensional gratings with broken up-down mirror symmetry
title_sort	true- and quasi-bound states in the continuum in one-dimensional gratings with broken up-down mirror symmetry
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/994b3abc1a6f4de99ae006e1d3466123
work_keys_str_mv	AT głowadzkaweronika trueandquasiboundstatesinthecontinuuminonedimensionalgratingswithbrokenupdownmirrorsymmetry AT wasiakmichał trueandquasiboundstatesinthecontinuuminonedimensionalgratingswithbrokenupdownmirrorsymmetry AT czyszanowskitomasz trueandquasiboundstatesinthecontinuuminonedimensionalgratingswithbrokenupdownmirrorsymmetry
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True- and quasi-bound states in the continuum in one-dimensional gratings with broken up-down mirror symmetry

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