通过复杂菲涅耳反射增强光的自旋-轨道相互作用
Enhanced Spin-Orbit Interaction of Light through Complex Fresnel Reflection
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中文总结 AI 辅助
本研究通过多层介质反射镜后向反射非傍轴聚焦光束，显著增强了光的自旋-轨道相互作用，同时增强了涡旋光束振幅和自旋霍尔效应，并展示了多种偏振奇点拓扑特征。
中文摘要 AI 辅助
光的自旋-轨道相互作用（SOI）表现为：当自旋极化光束分别以正入射和斜入射与光学界面相互作用时，会产生自旋相关的涡旋光束和自旋霍尔效应。弱的SOI限制了其在各种应用中量化物理量的广泛使用。我们通过在多层介质反射镜上后向反射非傍轴聚焦光束，展示了一种显著增强的SOI效应，接近强耦合区域。反射镜引入的入射角相关的菲涅耳反射系数（r-TE, r-TM）的较大差异，同时增强了反射光束中自旋-轨道转换的涡旋光束振幅和自旋霍尔效应。反射光束中正交偏振分量的近场叠加产生了具有C、V和L偏振奇点的空间非均匀光束场。这些拓扑特征被映射，并用于演示焦区中的横向和三维自旋霍尔效应。增强的光学近场叠加和反射镜反射率的无损耗宽带特性，预计将能够实现各种偏振拓扑，并通过设计的反射镜反射率来定制其特征。
英文摘要
Spin-orbit interaction (SOI) of light manifests as the generation of a spin-dependent vortex beam and the spin-Hall effect when a spin-polarized beam interacts with an optical interface at normal and oblique incidence, respectively. The weak SOI limits its widespread use for quantifying physical quantities in various applications. We demonstrate a significantly enhanced SOI effect, approaching the strong-coupling regime, by retroreflecting a nonparaxial focused beam of light at a multilayer dielectric mirror. The large difference in angle-of-incidence-dependent Fresnel reflection coefficients (r-TE, r-TM ) introduced by the mirror simultaneously enhances the spin-orbit-converted vortex-beam amplitude and the spin-Hall effect in the reflected beam. Near-field superposition of the orthogonal polarization components in the reflected beam yields a spatially nonuniform beam field with C-, V-, and L- polarization singularities. These topological features are mapped and are used to demonstrate the transverse and 3D spin-Hall effect in the focal region. The superposition of enhanced optical near-fields and the lossless broadband nature of the mirror reflectivity are expected to enable a variety of polarization topologies and to tailor their features via designed mirror reflectivities.
发表机构
- School of Physics, University of Hyderabad（海德拉巴大学物理学院）
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