Beijing Computational Science Research Center, Beijing 100193, People's Republic of China.
Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR 999077, People's Republic of China.
Nano Lett. 2023 May 24;23(10):4183-4190. doi: 10.1021/acs.nanolett.3c00054. Epub 2023 May 9.
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.
在纳米光子界面处沿不同方向对二维（2D）过渡金属二卤化物中的激子发射进行局部路由，对于开发有前途的 2D 激子系统用于功能纳米光学元件非常重要。然而，这种控制仍然难以实现。在此，我们报告了一种在 WS 单层上通过等离子体方法实现激子发射的电控制空间调制的简单方法。发射路由是通过放置在 WS 单层上的单个银纳米棒中的 WS 激子与多极等离子体模式之间的共振耦合实现的。与以前的演示不同，路由效果可以通过 WS 单层的掺杂水平来调制，从而实现电控制。我们的工作利用了简单棒状金属纳米晶体所支持的高质量等离子体模式，实现了对二维激子发射的角度分辨操纵。实现了主动控制，为纳米光源和纳米光子器件的发展提供了很好的机会。
