| High-efficiency nonlocal reflection-type vortex beam generation based on bound states in the continuumOA |
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| 作者姓名： | Tongyu Li Jiajun Wang Wenjie Zhang Xinhao Wang Wenzhe Liu Lei Shi Jian Zi |
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| 作者单位： | 1. State Key Laboratory of Surface Physics,Key Laboratory of Micro-and Nano-Photonic Structures (Ministry of Education) and Department of Physics,Fudan University;2. Department of Physics,The Hong Kong University of Science and Technology |
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| 基金项目： | the National Natural Science Foundation of China (12234007 and 12221004)； |
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| 摘 要： | Momentum-space polarization vortices centered at symmetry-protected bound states in the continuum of a periodic structure,e.g.photonic crystal slab,provide a novel nonlocal approach to generate vortex beams.This approach enjoys a great convenience of no precise alignment requirements,although the generation efficiency of the nonlocal generators requires further optimization before the practical application.In this work,we propose a temporal-coupled-mode-theory-based guideline for high-efficiency...
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