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22 November 2024 Polarization-independent quasi-BIC based on non-rotationally symmetric dimer metasurfaces
Zhisen Huang, Changhe Zhou
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Proceedings Volume 13240, Holography, Diffractive Optics, and Applications XIV; 132400A (2024) https://doi.org/10.1117/12.3036223
Event: SPIE/COS Photonics Asia, 2024, Nantong, Jiangsu, China
Abstract
Asymmetric metasurfaces supporting quasi-bound states in the continuum (-BIC) are especially important for photonic devices because they provide high-quality factor (Q-factor) resonances. However, asymmetric metasurface structures are susceptible to the polarization state of the incident light, which limits their potential applications. In this paper, we propose a new design scheme for polarization-independent quasi-BICs without resorting to rotationally symmetric and tetramer structures. Consistent quasi-BIC resonances are observed in the metasurface consisting of asymmetric double nanorods under incident light with different polarizations. Studies of the far-field multipole decomposition and near-field distribution show that different multipoles exhibit different dependencies on the direction of polarization and that transitions between magnetic and electric quadrupoles lead to polarizationindependent quasi-BIC resonances. This work provides a new idea for designing polarization-independent high Qfactor resonators and promotes a broader range of potential applications.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Zhisen Huang and Changhe Zhou "Polarization-independent quasi-BIC based on non-rotationally symmetric dimer metasurfaces", Proc. SPIE 13240, Holography, Diffractive Optics, and Applications XIV, 132400A (22 November 2024); https://doi.org/10.1117/12.3036223
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KEYWORDS
Polarization
Nanorods
Electric fields
Resonators
Scattering
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