Spin–Orbit Controlled Excitation of Quantum Emitters in Hybrid Plasmonic Nanocircuits,Advanced Optical Materials

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Spin–Orbit Controlled Excitation of Quantum Emitters in Hybrid Plasmonic Nanocircuits
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-09-03 , DOI: 10.1002/adom.202000854
Yinhui Kan ₁ , Shailesh Kumar ₂ , Fei Ding ₂ , Changying Zhao ₁ , Sergey I. Bozhevolnyi ₂

Affiliation

On‐chip realization of complex photonic functionalities is essential for further progress in planar integrated nanophotonics, especially when involving nonclassical light sources such as quantum emitters (QEs). Spin–orbit interactions on subwavelength scales are increasingly explored in nanophotonics for realization and utilization of the spin‐dependent flow of light. Here, a dielectric‐loaded plasmonic nanocircuit with an achiral spin–orbit coupler is proposed and realized for unidirectional spin‐controlled routing of pump visible radiation into branched QE‐integrated waveguides. It is experimentally demonstrated that the circular‐polarized 532 nm pump laser light selectively, with a directionality contrast of ≈30, couples into corresponding dielectric‐loaded plasmonic branched waveguides. Two spatially separated (by a distance of ≈10 µm) QEs, nanodiamonds containing multiple nitrogen vacancy centers, embedded into a hybrid plasmonic nanocircuit, can thereby be selectively and remotely excited using an incident pump beam with different circular polarizations. The realization of on‐chip spin–orbit controlled excitation of different QEs coupled to branched waveguides may open new avenues for designing complex plasmonic nanocircuits exploiting the spin degree of freedom within chiral nanophotonics.

中文翻译：

混合等离子纳米电路中量子发射体的自旋轨道控制激发。

片上实现复杂的光子功能对于平面集成纳米光子技术的进一步发展至关重要，尤其是在涉及非经典光源（例如量子发射器（QE））时。在纳米光子学中越来越多地探索亚波长尺度上的自旋轨道相互作用，以实现和利用自旋相关的光流。在这里，提出并实现了一种具有非手性自旋轨道耦合器的电介质加载等离子体纳米电路，用于将泵浦可见光辐射到分支的QE集成波导中的单向自旋控制路由。实验证明，圆偏振的532 nm抽运激光有方向性对比≈30，有选择地耦合到相应的介质加载的等离激元分支波导中。两个在空间上分开的QE，间距为≈10µm，因此，可以使用具有不同圆极化的入射泵浦光束，选择性地和远程地激发嵌入到混合等离子体纳米电路中的包含多个氮空位中心的纳米金刚石。片状自旋轨道控制的激发不同QE耦合到分支波导的实现可能为利用手性纳米光子学中的自旋自由度设计复杂的等离激元纳米电路开辟新的途径。

更新日期：2020-11-04

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