理解与等离子体晶格耦合的二维半导体中的不同激子-等离子体激元耦合状态：结合实验和统一运动方程的方法
Understanding the different exciton-plasmon coupling regimes in two-dimensional semiconductors coupled with plasmonic lattices: a combined experimental and unified equations of motion approach
摘要：
我们研究激子-等离子体激元耦合在二维半导体耦合Ag等离子体晶格通过角度分辨反射光谱，并通过求解运动方程（EOMs）在一个耦合振荡器模型占所有的共振系统。在EOM模型中考虑了五种共振：半导体A和B激子，等离子体纳米结构的局部表面等离子体共振（LSPR）和等离子体阵列的晶格衍射模式。我们研究了不同二维半导体和等离子体晶格几何结构中的激子-等离子体激元耦合，包括单层MoS 2和WS 2与Ag纳米盘和蝴蝶结阵列的耦合，并通过具有不同激子-等离子体激元耦合参数的EOM模型研究了耦合系统中的色散和线形演化。EOM方法对激子-等离子体激元相互作用在弱、中、强耦合情况下提供了统一的描述，正确解释了复杂系统的色散和线形。这项研究提供了一个更深入的了解光-物质相互作用的多级系统中的一般，将是有用的，以指导设计新颖的二维激子等离子体激元器件的各种光电应用与精确定制的响应。
英文摘要：
We study exciton-plasmon coupling in two-dimensional semiconductors coupled with Ag plasmonic lattices via angle-resolved reflectance spectroscopy and by solving the equations of motion (EOMs) in a coupled oscillator model accounting for all the resonances of the system. Five resonances are considered in the EOM model: semiconductor A and B excitons, localized surface plasmon resonances (LSPRs) of plasmonic nanostructures and the lattice diffraction modes of the plasmonic array. We investigated the exciton-plasmon coupling in different 2D semiconductors and plasmonic lattice geometries, including monolayer MoS2 and WS2 coupled with Ag nanodisk and bowtie arrays, and examined the dispersion and lineshape evolution in the coupled systems via the EOM model with different exciton-plasmon coupling parameters. The EOM approach provides a unified description of the exciton-plasmon interaction in the weak, intermediate and strong coupling cases with correctly explaining the dispersion and lineshapes of the complex system. This study provides a much deeper understanding of light-matter interactions in multilevel systems in general and will be useful to instruct the design of novel two-dimensional exciton-plasmonic devices for a variety of optoelectronic applications with precisely tailored responses.
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