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arXiv · 2402.01080

Photonic Spin-Orbit Coupling Induced by Deep-Subwavelength Structured Light

Xin Zhang·Guohua Liu·Yanwen Hu·Haolin Lin·Zepei Zeng·Xiliang Zhang·Zhen Li·Zhenqiang Chen·Shenhe Fu
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Abstract

We demonstrate both theoretically and experimentally beam-dependent photonic spin-orbit coupling in a two-wave mixing process described by an equivalent of the Pauli equation in quantum mechanics. The considered structured light in the system is comprising a superposition of two orthogonal spin-orbit-coupled states defined as spin up and spin down equivalents. The spin-orbit coupling is manifested by prominent pseudo spin precession as well as spin-transport-induced orbital angular momentum generation in a photonic crystal film of wavelength thickness. The coupling effect is significantly enhanced by using a deep-subwavelength carrier envelope, different from previous studies which depend on materials. The beam-dependent coupling effect can find intriguing applications; for instance, it is used in precisely measuring variation of light with spatial resolution up to 15 nm.

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Xin Zhang, Guohua Liu, Yanwen Hu, Haolin Lin, Zepei Zeng, Xiliang Zhang, Zhen Li, Zhenqiang Chen, Shenhe Fu. 2024-02-02. Photonic Spin-Orbit Coupling Induced by Deep-Subwavelength Structured Light. https://arxiv.org/abs/2402.01080

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