The interaction between the chiral light and matter is vital to construct on-chip multi-functional photonic circuits. The well-known spin-orbit interaction has obtained significant attention in manipulation of light with different circular polarization states. We propose a robust Y-type surface plasmon nano-waveguide structure to effectively sort spin-dependent photons. The optimized simulation results demonstrated that the waveguide modes excited by circularly polarized light with different spin states can be selectively coupled to one of two branching waveguides, with a unidirectionality efficiency up to 0.95. This research may open up new ways for the on-chip implementation of complex photonic functions, nano-photonic circuits, and nano-optical manipulation.

中文翻译：

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通过 Y 型等离子体纳米电路选择性地分类自旋相关光子

手性光与物质之间的相互作用对于构建片上多功能光子电路至关重要。众所周知的自旋轨道相互作用在操纵不同圆偏振态的光方面引起了极大的关注。我们提出了一种坚固的 Y 型表面等离子体纳米波导结构，可以有效地对自旋相关光子进行分类。优化仿真结果表明，不同自旋态圆偏振光激发的波导模式可以选择性地耦合到两个分支波导之一，单向效率高达0.95。这项研究可能为复杂光子功能、纳米光子电路和纳米光学操纵的片上实现开辟新的途径。