The efficiency of photoluminescence (PL) of transition-metal dichalcogenides (TMDCs) significantly influences their practical applications in optoelectronic devices. In this work, we study multiple coupling among excitons, surface plasmons, and optical modes, and their effects on PL of monolayer ${\mathrm{MoS}}_2$ atop plasmonic nanohole arrays. Under the illumination of visible light, strong intensity enhancement of PL from monolayer ${\mathrm{MoS}}_2$ is observed in the system. We further demonstrate that there exist excitons induced from ${\mathrm{MoS}}_2$, localized and propagating surface plasmons excited from nanoholes, and optical modes related to the incident laser. And hybrid coupling of those modes significantly improves the PL signals and also lightens the PL images of monolayer ${\mathrm{MoS}}_2$. This work provides a unique way to improve the emission of monolayer TMDCs. The atomically thin TMDCs coupled to plasmonic metamaterials are also promising for advanced applications such as ultrathin integrated light-emission diodes, photodetection, and nanolasers.

中文翻译：

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杂化耦合增强了等离子纳米结构上单层MoS _2的光致发光

过渡金属二卤化物（TMDC）的光致发光（PL）效率极大地影响了它们在光电器件中的实际应用。在这项工作中，我们研究了激子，表面等离激元和光学模式之间的多重耦合，以及它们对单层PL的影响。${\mathrm{硫化钼}}_{\mathrm{2个}}$在等离激元纳米孔阵列上。在可见光的照射下，单层PL的光强增强${\mathrm{硫化钼}}_{\mathrm{2个}}$在系统中被观察到。我们进一步证明存在从中诱发的激子${\mathrm{硫化钼}}_{\mathrm{2个}}$，从纳米孔激发的局部等离激元等离激元，以及与入射激光有关的光学模式。这些模式的混合耦合显着改善了PL信号，并且减轻了单层的PL图像${\mathrm{硫化钼}}_{\mathrm{2个}}$。这项工作提供了一种改善单层TMDC发射的独特方法。与等离子超材料耦合的原子薄TMDC也有望用于高级应用，例如超薄集成发光二极管，光电检测和纳米激光。