Routing the Exciton Emissions of WS 2 Monolayer with the High-Order Plasmon Modes of Ag Nanorods

Locally routing the exciton emissions in two-dimensional (2D) transition-metal dichalcogenides along different directions at the nanophotonic interface is of great interest in exploiting the promising 2D excitonic systems for functional nano-optical components. However, such control has remained elu...

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Bibliographic Details
Published in:Nano letters 2023-05, Vol.23 (10), p.4183-4190
Main Authors: Li, Shasha, Ai, Ruoqi, Chui, Ka Kit, Fang, Yini, Lai, Yunhe, Zhuo, Xiaolu, Shao, Lei, Wang, Jianfang, Lin, Hai-Qing
Format: Article
Language:English
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Summary:Locally routing the exciton emissions in two-dimensional (2D) transition-metal dichalcogenides along different directions at the nanophotonic interface is of great interest in exploiting the promising 2D excitonic systems for functional nano-optical components. However, such control has remained elusive. Herein we report on a facile plasmonic approach for electrically controlled spatial modulation of the exciton emissions in a WS monolayer. The emission routing is enabled by the resonance coupling between the WS excitons and the multipole plasmon modes in individual silver nanorods placed on a WS monolayer. Different from prior demonstrations, the routing effect can be modulated by the doping level of the WS monolayer, enabling electrical control. Our work takes advantage of the high-quality plasmon modes supported by simple rod-shaped metal nanocrystals for the angularly resolved manipulation of 2D exciton emissions. Active control is achieved, which offers great opportunities for the development of nanoscale light sources and nanophotonic devices.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.3c00054