Plasmonic metasurfaces form a convenient platform for light manipulation at the nanoscale due to their specific localized surface plasmons. Even despite high intrinsic Joule losses, plasmonic nanoparticles are very effective for light manipulation. Here, we show the lattice of plasmonic nanoparticles onto a dielectric waveguide that efficiently couples oppositely propagating guided modes to circularly polarized light beams of different handedness. We demonstrate 80% degree of circular polarization for the out-coupled emission of GaAs-waveguide-embedded quantum dots. The results allow us to consider the lattice as a circular-polarization-controlled grating coupler and make this structure prospective for further implementation as an efficient coupling interface for integrated devices.

中文翻译：

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用于波导增强自发辐射的圆偏振外耦合的等离子体光栅

由于其特定的局部表面等离子体激元，等离子体超表面形成了一个方便的纳米级光操纵平台。尽管本征焦耳损失很高，但等离子体纳米粒子对于光操纵非常有效。在这里，我们展示了等离子体纳米粒子在介电波导上的晶格，该介电波导有效地将反向传播的导模耦合到不同手性的圆偏振光束。我们展示了 GaAs 波导嵌入量子点的外耦合发射的 80% 圆偏振度。结果使我们能够将晶格视为圆偏振控制的光栅耦合器，并使该结构有望进一步实现为集成设备的有效耦合接口。