Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing, Jiangsu 210096, China.
Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology, Ministry of Education, and School of Instrument Science and Engineering, Southeast University, Nanjing, Jiangsu 210096, China.
Nano Lett. 2022 Sep 14;22(17):6923-6929. doi: 10.1021/acs.nanolett.2c01442. Epub 2022 Aug 25.
Excitons in two-dimensional (2D) materials have attracted the attention of the community to develop improved photoelectronic devices. Previous reports are based on direct excitation where the out-of-plane illumination projects a uniform single-mode light spot. However, because of the optical diffraction limit, the minimal spot size is a few micrometers, inhibiting the precise manipulation and control of excitons at the nanoscale level. Herein, we introduced the in-plane coherent surface plasmonic interference (SPI) field to excite and modulate excitons remotely. Compared to the out-of-plane light, a uniform in-plane SPI suggests a more compact spatial volume and an abundance of mode selections for a single or an array of device modulation. Our results not only build up a fundamental platform for operating and encoding the exciton states at the nanoscale level but also provide a new avenue toward all-optical integrated valleytronic chips for future quantum computation and information applications.
二维（2D）材料中的激子引起了人们的关注，促使开发出改进的光电设备。之前的报告基于直接激发，其中面外照明投射出均匀的单模光斑。然而，由于光学衍射极限，最小光斑尺寸约为几微米，这限制了在纳米尺度水平上对激子的精确操作和控制。在本文中，我们引入了平面相干表面等离激元干涉（SPI）场来远程激发和调制激子。与面外光相比，均匀的面内 SPI 表明具有更紧凑的空间体积和丰富的模式选择，可用于单个或多个器件的调制。我们的研究结果不仅为在纳米尺度水平上操作和编码激子态建立了一个基本平台，而且为未来量子计算和信息应用的全光集成谷电子芯片提供了新途径。
