Abstract Plasmonic nanostructures have garnered tremendous interest in enhanced light–matter interaction because of their unique capability of extreme field confinement in nanoscale, especially beneficial for boosting the photoluminescence (PL) signals of weak light–matter interaction materials such as transition metal dichalcogenides atomic crystals. Here we report the surface plasmon polariton (SPP)-assisted PL enhancement of MoS2 monolayer via a suspended periodic metallic (SPM) structure. Without involving metallic nanoparticle–based plasmonic geometries, the SPM structure can enable more than two orders of magnitude PL enhancement. Systematic analysis unravels the underlying physics of the pronounced enhancement to two primary plasmonic effects: concentrated local field of SPP enabled excitation rate increment (45.2) as well as the quantum yield amplification (5.4 times) by the SPM nanostructure, overwhelming most of the nanoparticle-based geometries reported thus far. Our results provide a powerful way to boost two-dimensional exciton emission by plasmonic effects which may shed light on the on-chip photonic integration of 2D materials.

中文翻译：

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悬浮周期性金属结构上单层二硫化钼的表面等离子体极化增强光致发光

摘要 等离子体纳米结构在增强光-物质相互作用方面引起了极大的兴趣，因为它们在纳米尺度上具有独特的极场限制能力，特别有利于增强弱光-物质相互作用材料（如过渡金属二硫属元素化物原子晶体）的光致发光（PL）信号。在这里，我们报告了通过悬浮周期性金属 (SPM) 结构对 MoS2 单层进行表面等离子体激元 (SPP) 辅助 PL 增强。在不涉及基于金属纳米粒子的等离子体几何结构的情况下，SPM 结构可以实现超过两个数量级的 PL 增强。系统分析揭示了两个主要等离子体效应显着增强的基本物理原理：SPP 的集中局部场使激发速率增加 (45. 2）以及SPM纳米结构的量子产率放大（5.4倍），压倒了迄今为止报道的大多数基于纳米颗粒的几何形状。我们的研究结果提供了一种通过等离子体效应增强二维激子发射的有效方法，这可能有助于阐明二维材料的片上光子集成。