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arXiv · 2512.21006

Magneto-optical Skyrmion for manipulation of arbitrary light polarization

Xinghong Chen·Xingxiang Wang·Guanjie Zhang·Xiao Hu·Wei Tao·Tomohiro Amemiya·Yifei Mao
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Abstract

Dynamic manipulation of arbitrary light polarization is of fundamental importance for versatile optical functionalities, yet realizing such full-Poincar\'e-sphere control within compact nanophotonic architectures remains a formidable challenge. Here, we theoretically propose and numerically demonstrate a magneto-optical skyrmion platform enabling full polarization control of cavity eigenmodes. We reveal the correspondence between the near-field wavefunctions of degenerate dipoles and far-field polarization. By applying multidirectional magnetic fields to magneto-optical photonic crystals, we achieve any complex superposition of orthogonal eigenmodes, thereby realizing arbitrary far-field polarization. This mapping manifests as a skyrmion with a topological charge of 2, guaranteeing coverage of the entire Poincar\'e sphere. Our theoretical model shows excellent agreement with full-wave simulations. Furthermore, we realize bound states in the continuum (BICs) with dynamically tunable polarization textures and demonstrate high-performance polarization-selective emission and transmission. This work establishes a topological paradigm for precise polarization shaping, offering new avenues for advanced optical communication and sensing.

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Xinghong Chen, Xingxiang Wang, Guanjie Zhang, Xiao Hu, Wei Tao, Tomohiro Amemiya, Yifei Mao. 2025-12-24. Magneto-optical Skyrmion for manipulation of arbitrary light polarization. https://arxiv.org/abs/2512.21006

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