单层
光致发光
等离子体子
光电子学
材料科学
激子
光子学
纳米光子学
共振(粒子物理)
光发射
纳米技术
物理
凝聚态物理
粒子物理学
作者
Chenyang Li,Huan Luo,Liping Hou,Qifa Wang,Kaihui Liu,Xuetao Gan,Jianlin Zhao,Fajun Xiao
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-04-23
标识
DOI:10.1021/acs.nanolett.4c01260
摘要
Monolayer transition metal dichalcogenides (TMDs) are considered promising building blocks for next-generation photonic and optoelectronic devices, owing to their fascinating optical properties. However, their inherent weak light absorption and low quantum yield severely hinder their practical applications. Here, we report up to 18000-fold photoluminescence (PL) enhancement in a monolayer WSe2-coupled plasmonic nanocavity. A spectroscopy-assisted nanomanipulation technique enables the assembly of a nanocavity with customizable resonances to simultaneously enhance the excitation and emission processes. In particular, precise control over the magnetic cavity mode facilitates spectral and spatial overlap with the exciton, resulting in plasmon–exciton intermediate coupling that approaches the maximum emission rate in the hybrid system. Meanwhile, the cavity mode exhibits high radiation directivity, which overwhelmingly directs surface-normal PL emission and leads to a 17-fold increase in the collection efficiency. Our approach opens up a new avenue to enhance the PL intensity of monolayer TMDs, facilitating their implementation in highly efficient optoelectronic devices.
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