Active angular tuning and switching of Brewster quasi bound states in the continuum in magneto-optic metasurfaces

Bound states in the continuum (BICs) emerge throughout physics as leaky/resonant modes that remain, however, highly localized. They have attracted much attention in photonics, and especially in metasurfaces. One of their most outstanding features is their divergent Q-factors, indeed arbitrarily larg...

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Autores principales:	Abujetas Diego R., de Sousa Nuno, García-Martín Antonio, Llorens José M., Sánchez-Gil José A.
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	all-dielectric metasurfaces bound states in the continuum magneto-optics Physics QC1-999
Acceso en línea:	https://doaj.org/article/b8a5f21fb04546d3a04beb742ad84434
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id	oai:doaj.org-article:b8a5f21fb04546d3a04beb742ad84434
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spelling	oai:doaj.org-article:b8a5f21fb04546d3a04beb742ad844342021-12-05T14:10:56ZActive angular tuning and switching of Brewster quasi bound states in the continuum in magneto-optic metasurfaces2192-861410.1515/nanoph-2021-0412https://doaj.org/article/b8a5f21fb04546d3a04beb742ad844342021-10-01T00:00:00Zhttps://doi.org/10.1515/nanoph-2021-0412https://doaj.org/toc/2192-8614Bound states in the continuum (BICs) emerge throughout physics as leaky/resonant modes that remain, however, highly localized. They have attracted much attention in photonics, and especially in metasurfaces. One of their most outstanding features is their divergent Q-factors, indeed arbitrarily large upon approaching the BIC condition (quasi-BICs). Here, we investigate how to tune quasi-BICs in magneto-optic (MO) all-dielectric metasurfaces. The impact of the applied magnetic field in the BIC parameter space is revealed for a metasurface consisting of lossless semiconductor spheres with MO response. Through our coupled electric/magnetic dipole formulation, the MO activity is found to manifest itself through the interference of the out-of-plane electric/magnetic dipole resonances with the (MO-induced) in-plane magnetic/electric dipole, leading to a rich, magnetically tuned quasi-BIC phenomenology, resembling the behavior of Brewster quasi-BICs for tilted vertical-dipole resonant metasurfaces. Such resemblance underlies our proposed design for a fast MO switch of a Brewster quasi-BIC by simply reversing the driving magnetic field. This MO-active BIC behavior is further confirmed in the optical regime for a realistic Bi:YIG nanodisk metasurface through numerical calculations. Our results present various mechanisms to magneto-optically manipulate BICs and quasi-BICs, which could be exploited throughout the electromagnetic spectrum with applications in lasing, filtering, and sensing.Abujetas Diego R.de Sousa NunoGarcía-Martín AntonioLlorens José M.Sánchez-Gil José A.De Gruyterarticleall-dielectric metasurfacesbound states in the continuummagneto-opticsPhysicsQC1-999ENNanophotonics, Vol 10, Iss 17, Pp 4223-4232 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	all-dielectric metasurfaces bound states in the continuum magneto-optics Physics QC1-999
spellingShingle	all-dielectric metasurfaces bound states in the continuum magneto-optics Physics QC1-999 Abujetas Diego R. de Sousa Nuno García-Martín Antonio Llorens José M. Sánchez-Gil José A. Active angular tuning and switching of Brewster quasi bound states in the continuum in magneto-optic metasurfaces
description	Bound states in the continuum (BICs) emerge throughout physics as leaky/resonant modes that remain, however, highly localized. They have attracted much attention in photonics, and especially in metasurfaces. One of their most outstanding features is their divergent Q-factors, indeed arbitrarily large upon approaching the BIC condition (quasi-BICs). Here, we investigate how to tune quasi-BICs in magneto-optic (MO) all-dielectric metasurfaces. The impact of the applied magnetic field in the BIC parameter space is revealed for a metasurface consisting of lossless semiconductor spheres with MO response. Through our coupled electric/magnetic dipole formulation, the MO activity is found to manifest itself through the interference of the out-of-plane electric/magnetic dipole resonances with the (MO-induced) in-plane magnetic/electric dipole, leading to a rich, magnetically tuned quasi-BIC phenomenology, resembling the behavior of Brewster quasi-BICs for tilted vertical-dipole resonant metasurfaces. Such resemblance underlies our proposed design for a fast MO switch of a Brewster quasi-BIC by simply reversing the driving magnetic field. This MO-active BIC behavior is further confirmed in the optical regime for a realistic Bi:YIG nanodisk metasurface through numerical calculations. Our results present various mechanisms to magneto-optically manipulate BICs and quasi-BICs, which could be exploited throughout the electromagnetic spectrum with applications in lasing, filtering, and sensing.
format	article
author	Abujetas Diego R. de Sousa Nuno García-Martín Antonio Llorens José M. Sánchez-Gil José A.
author_facet	Abujetas Diego R. de Sousa Nuno García-Martín Antonio Llorens José M. Sánchez-Gil José A.
author_sort	Abujetas Diego R.
title	Active angular tuning and switching of Brewster quasi bound states in the continuum in magneto-optic metasurfaces
title_short	Active angular tuning and switching of Brewster quasi bound states in the continuum in magneto-optic metasurfaces
title_full	Active angular tuning and switching of Brewster quasi bound states in the continuum in magneto-optic metasurfaces
title_fullStr	Active angular tuning and switching of Brewster quasi bound states in the continuum in magneto-optic metasurfaces
title_full_unstemmed	Active angular tuning and switching of Brewster quasi bound states in the continuum in magneto-optic metasurfaces
title_sort	active angular tuning and switching of brewster quasi bound states in the continuum in magneto-optic metasurfaces
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/b8a5f21fb04546d3a04beb742ad84434
work_keys_str_mv	AT abujetasdiegor activeangulartuningandswitchingofbrewsterquasiboundstatesinthecontinuuminmagnetoopticmetasurfaces AT desousanuno activeangulartuningandswitchingofbrewsterquasiboundstatesinthecontinuuminmagnetoopticmetasurfaces AT garciamartinantonio activeangulartuningandswitchingofbrewsterquasiboundstatesinthecontinuuminmagnetoopticmetasurfaces AT llorensjosem activeangulartuningandswitchingofbrewsterquasiboundstatesinthecontinuuminmagnetoopticmetasurfaces AT sanchezgiljosea activeangulartuningandswitchingofbrewsterquasiboundstatesinthecontinuuminmagnetoopticmetasurfaces
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Active angular tuning and switching of Brewster quasi bound states in the continuum in magneto-optic metasurfaces

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