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...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2021-10-01
|
| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2021-0412 |
| _version_ | 1811190863160672256 |
|---|---|
| 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. |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-04-11T14:57:32Z |
| format | Article |
| id | doaj.art-b8a5f21fb04546d3a04beb742ad84434 |
| institution | Directory Open Access Journal |
| issn | 2192-8614 |
| language | English |
| last_indexed | 2024-04-11T14:57:32Z |
| publishDate | 2021-10-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj.art-b8a5f21fb04546d3a04beb742ad844342022-12-22T04:17:11ZengDe GruyterNanophotonics2192-86142021-10-0110174223423210.1515/nanoph-2021-0412Active angular tuning and switching of Brewster quasi bound states in the continuum in magneto-optic metasurfacesAbujetas Diego R.0de Sousa Nuno1García-Martín Antonio2Llorens José M.3Sánchez-Gil José A.4Instituto de Estructura de la Materia (IEM-CSIC), Consejo Superior de Investigaciones Científicas, Serrano 121, 28006Madrid, SpainDonostia International Physics Center (DIPC), 20018Donostia-San Sebastián, SpainInstituto de Micro y Nanotecnología IMN-CNM, CSIC, CEI UAM + CSIC, Isaac Newton 8, Tres Cantos, Madrid28760, SpainInstituto de Micro y Nanotecnología IMN-CNM, CSIC, CEI UAM + CSIC, Isaac Newton 8, Tres Cantos, Madrid28760, SpainInstituto de Estructura de la Materia (IEM-CSIC), Consejo Superior de Investigaciones Científicas, Serrano 121, 28006Madrid, SpainBound 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.https://doi.org/10.1515/nanoph-2021-0412all-dielectric metasurfacesbound states in the continuummagneto-optics |
| spellingShingle | 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 Nanophotonics all-dielectric metasurfaces bound states in the continuum magneto-optics |
| title | 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_short | 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 |
| topic | all-dielectric metasurfaces bound states in the continuum magneto-optics |
| url | https://doi.org/10.1515/nanoph-2021-0412 |
| work_keys_str_mv | AT abujetasdiegor activeangulartuningandswitchingofbrewsterquasiboundstatesinthecontinuuminmagnetoopticmetasurfaces AT desousanuno activeangulartuningandswitchingofbrewsterquasiboundstatesinthecontinuuminmagnetoopticmetasurfaces AT garciamartinantonio activeangulartuningandswitchingofbrewsterquasiboundstatesinthecontinuuminmagnetoopticmetasurfaces AT llorensjosem activeangulartuningandswitchingofbrewsterquasiboundstatesinthecontinuuminmagnetoopticmetasurfaces AT sanchezgiljosea activeangulartuningandswitchingofbrewsterquasiboundstatesinthecontinuuminmagnetoopticmetasurfaces |