Affiliation:
1. Guizhou Minzu University
2. Anshun University
Abstract
Optical metasurfaces with high
Q
-factors have attracted much attention due to their sharp spectral features and significant field enhancement. The excitation of symmetry-protected bound states in the continuum (SP-BICs) is an efficient way to achieve a high
Q
-factor resonator. The experimental
Q
-factors of resonant quasi-SP-BIC metasurfaces are currently not high. In this work, we numerically demonstrate the stability of SP-BICs in silicon metasurfaces. The two SP-BICs are transformed into quasi-SP-BICs by breaking the in-plane symmetry of the structure, and their resonance properties are discussed by far-field radiation and near-field distribution. Moreover, the effects of different periods, sizes, substrate refractive indices, and shape factors on the SP-BICs are explored, and the
Q
-factors of quasi-SP-BICs always exhibit the same inverse quadratic dependence on asymmetry parameters, which demonstrates the stability of the SP-BIC. Our results may provide theoretical support for the experimental realization of ultrahigh
Q
-factor quasi-SP-BICs.
Funder
National Natural Science Foundation of China
Guizhou Provincial Science and Technology Projects
Youth Science and Technology Talent Project of Guizhou Province
Natural Science Research Project of Guizhou Minzu University
Undergraduate Innovation and Entrepreneurship Training Program of Guizhou Province
Subject
Atomic and Molecular Physics, and Optics,Statistical and Nonlinear Physics
Cited by
5 articles.
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