激子
单层
材料科学
光致发光
纳米棒
等离子体子
光电子学
应变工程
纳米光子学
光发射
三极管
纳米技术
凝聚态物理
物理
硅
作者
Shasha Li,Ka Kit Chui,Fuhuan Shen,He Huang,Shi-Zheng Wen,ChiYung Yam,Lei Shao,Jianbin Xu,Jianfang Wang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-07-11
卷期号:16 (7): 10647-10656
被引量:1
标识
DOI:10.1021/acsnano.2c02300
摘要
Excitons in a transition-metal dichalcogenide (TMDC) monolayer can be modulated through strain with spatial and spectral control, which offers opportunities for constructing quantum emitters for applications in on-chip quantum communication and information processing. Strain-localized excitons in TMDC monolayers have so far mainly been observed under cryogenic conditions because of their subwavelength emission area, low quantum yield, and thermal-fluctuation-induced delocalization. Herein, we demonstrate both generation and detection of strain-localized excitons in WS2 monolayer through a simple plasmonic structure design, where WS2 monolayer covers individual Au nanodisks or nanorods. Enhanced emission from the strain-localized excitons of the deformed WS2 monolayer near the plasmonic hotspots is observed at room temperature with a photoluminescence energy redshift up to 200 meV. The emission intensity and peak energy of the strain-localized excitons can be adjusted by the nanodisk size. Furthermore, the excitation and emission polarization of the strain-localized excitons are modulated by anisotropic Au nanorods. Our results provide a promising strategy for constructing nonclassical integrated light sources, high-sensitivity strain sensors, or tunable nanolasers for future dense nanophotonic integrated circuits.
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