Quasi-bound states in the continuum induced by in-plane and out-of-plane asymmetry in all-dielectric metasurfaces

In this paper, we propose a periodic structure consisting of a pair of square holes etched through square silicon substrates to achieve a high-Q quasi-BIC resonance peak at 1524 nm. The simulation results indicate that the Q factor of the excited quasi-BIC can reach 12,660. Multipole decomposition a...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2024-09, Vol.63 (9), p.90904
Main Authors: Zhou, Yiran, Ni, Bo, Ni, Haibin, Zhou, Xiaoyan, Yang, Lingsheng, Chang, Jianhua
Format: Article
Language:English
Subjects:
All-Dielectric metasurface
High Q factor
Magnetic dipoles
Multipoles
Periodic structures
Quadrupoles
Quasi bound states in continuum
Robustness
Silicon substrates
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Summary:In this paper, we propose a periodic structure consisting of a pair of square holes etched through square silicon substrates to achieve a high-Q quasi-BIC resonance peak at 1524 nm. The simulation results indicate that the Q factor of the excited quasi-BIC can reach 12,660. Multipole decomposition and near-field distribution show that the quasi-BIC of the square etched hole structure is primarily dominated by magnetic dipoles, electric quadrupoles, and magnetic quadrupoles. When structural parameters shift in other directions, or when the square hole is rotated or changed to a circle, this quasi-BIC demonstrates good robustness.
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/ad74c4