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Título: | Active angular tuning and switching of Brewster quasi bound states in the continuum in magneto-optic metasurfaces |
Autor: | Abujetas, Diego R. CSIC ORCID; Sousa, Nuno de; García-Martín, Antonio CSIC ORCID ; Llorens Montolio, José Manuel CSIC ORCID; Sánchez-Gil, José A. CSIC ORCID | Palabras clave: | All-dielectric metasurfaces Bound states in the continuum Magneto-optics |
Fecha de publicación: | 1-oct-2021 | Editor: | Walter de Gruyter | Citación: | Nanophotonics 10(17): 4223-4232 (2021) | Resumen: | 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. | Versión del editor: | http://dx.doi.org/10.1515/nanoph-2021-0412 | URI: | http://hdl.handle.net/10261/260893 | DOI: | 10.1515/nanoph-2021-0412 | Identificadores: | doi: 10.1515/nanoph-2021-0412 e-issn: 2192-8614 issn: 2192-8606 |
Aparece en las colecciones: | (CFMAC-IEM) Artículos (IMN-CNM) Artículos |
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