Light-Controlled Near-Field Energy Transfer in Plasmonic Metasurface Coupled MoS2Monolayer
Light-Controlled Near-Field Energy Transfer in Plasmonic Metasurface Coupled MoS2Monolayer
复制标题
等离子超表面耦合 MoS2 单层中的光控近场能量转移
DOI：
10.1002/smll.202003539
复制
发表时间：
2020-09-16
期刊：
影响因子：
13.3
通讯作者：
Fang, Zheyu
中科院分区：
文献类型：
--
作者：
Deng, Miaoyi;Li, Ziwei;Fang, Zheyu
从等离子体纳米结构到半导体的能量转移已经被广泛研究，以增强光捕获和定制光-物质相互作用。在本研究中，报道了在近场耦合条件下，从金超表面到单层MoS(2)的有效能量转移。设计并制作了具有强光致发光（PL）和阴极发光（CL）发射光谱的超表面。在具有超表面的MoS(2)的耦合异质结构中，单层MoS(2)的拉曼位移和吸收光谱强度都受到影响。由于等离子体纳米结构和半导体之间的能量传递，可以定制光谱轮廓和PL峰位置。超快寿命测量证实了这一点。提出了两个耦合振荡器的理论模型，该模型的展开一般解（EGS）得到了一系列与调制二硫化钼中能级的重整化相对应的特征值。该模型可以预测混合结构中高达几十纳米的峰移，从而为描述金属结构和二维半导体之间的能量传递提供了一种替代方法。提出了一种利用近场能量转移研究二维半导体中光-物质相互作用的可行方法，这可能会刺激功能纳米光子器件的应用。
The energy transfer from plasmonic nanostructures to semiconductors has been extensively studied to enhance light-harvesting and tailor light-matter interactions. In this study, the efficient energy transfer from an Au metasurface to monolayered MoS(2)within a near-field coupling regime is reported. The metasurface is designed and fabricated to demonstrate strong photoluminescence (PL) and cathodoluminescence (CL) emission spectra. In the coupled heterostructure of MoS(2)with a metasurface, both the Raman shift and absorption spectral intensities of monolayered MoS(2)are affected. The spectral profile and PL peak position can be tailored owing to the energy transfer between plasmonic nanostructures and semiconductors. This is confirmed by ultrafast lifetime measurement. A theoretical model of two coupled oscillators is proposed, where the expanded general solutions (EGS) of such a model result in a series of eigenvalues that correspond to the renormalization of energy levels in modulated MoS2. The model can predict the peak shift up to tens of nanometers in hybrid structures and hence provides an alternative method to describe energy transfer between metallic structures and two-dimensional (2D) semiconductors. A viable approach for studying light-matter interactions in 2D semiconductors via near-field energy transfer is presented, which may stimulate the applications of functional nanophotonic devices.