Ji, J.; Lv, X.; Li, C.; Yang, X.; Guo, Y. Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum. Photonics2023, 10, 1194.
Ji, J.; Lv, X.; Li, C.; Yang, X.; Guo, Y. Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum. Photonics 2023, 10, 1194.
Ji, J.; Lv, X.; Li, C.; Yang, X.; Guo, Y. Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum. Photonics2023, 10, 1194.
Ji, J.; Lv, X.; Li, C.; Yang, X.; Guo, Y. Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum. Photonics 2023, 10, 1194.
Abstract
An all-dielectric metasurface composed of orthogonal-slit silicon disks is proposed in this study. By modifying the unit structure of the metasurface with the bound states in the continuum (BIC) theory, a sharp Fano resonance can be generated. The resonance properties of the metasurface are investigated by analyzing the effects of the structural parameters on the resonance using the eigenmode analysis method. The Q factor and the resonance wavelength can be adjusted by varying the slit width, the disk thickness, and the disk radius. The electromagnetic characteristics and mechanism of the toroidal dipole-BIC (TD-BIC) are explored in depth through an analysis of the multipole expansion of the scattered power, along with the electromagnetic field and the current distribution at resonance. This research provides a novel approach for excitation of a strong TD-BIC resonance and proposes potential applications in optical switches, high-sensitivity optical sensors, and related areas.
Keywords
metasurface; all-dielectric metasurface; bound states in the continuum; TD-BIC; Fano resonance; Q factor
Subject
Physical Sciences, Optics and Photonics
Copyright:
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