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Optical force based on quasi-bound states in the continuum induced by Brillouin zone folding in all-dielectric gratings
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DOI：10.1364/AO.591622.png)
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Abstract
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This study investigates optical force based on quasi-bound states in the continuum (quasi-BICs) induced by Brillouin zone folding in an all-dielectric silicon grating. Periodic perturbations generate quasi-BICs, enabling efficient and stable trapping. The trapping performance depends on the asymmetry parameter, achieving a potential depth over 180kB T for a 25 nm particle under 1.12 mW/& micro;m2 illumination. Multipole analysis reveals that the toroidal dipole (TD) dominates the trapping process. The system shows strong robustness, maintaining high Q-factors and stable potentials, providing insights for quasi-BIC-based optical manipulation. (c) 2026 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.
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