Chen Pei-Gang, Li Zhiyong, Qi Yun, Lo Tsz Wing, Wang Shubo, Jin Wei, Wong Kwok-Yin, Fan Shanhui, Zayats Anatoly V, Lei Dangyuan
Department of Materials Science and Engineering, The City University of Hong Kong, Hong Kong 999077, China.
State Key Laboratory of Chemical Biology and Drug Discovery, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong 999077, China.
ACS Nano. 2021 Nov 23;15(11):18163-18171. doi: 10.1021/acsnano.1c06955. Epub 2021 Nov 3.
Valley-dependent excitation and emission in transition metal dichalcogenides (TMDCs) have recently emerged as a new avenue for optical data manipulation, quantum optical technologies, and chiral photonics. The valley-polarized electronic states can be optically addressed through photonic spin-orbit interaction of excitonic emission, typically with plasmonic nanostructures, but their performance is limited by the low quantum yield of neutral excitons in TMDC multilayers and the large Ohmic loss of plasmonic systems. Here, we demonstrate a valleytronic system based on the trion emission in high-quantum-yield WS monolayers chirally coupled to a low-loss microfiber. The integrated system uses the spin properties of the waveguided modes to achieve long-range directional routing of valley excitations and also provides an approach to selectively address valley-dependent emission from different spatial locations around the microfiber. This valleytronic interface can be integrated with fiber communication devices, allowing for merging valley polarization and chiral photonics as an alternative mechanism for optical information transport and manipulation in classical and quantum regimes.
过渡金属二硫属化物（TMDCs）中依赖谷的激发和发射最近成为光学数据处理、量子光学技术和手性光子学的新途径。谷极化电子态可以通过激子发射的光子自旋 - 轨道相互作用进行光学寻址，通常是与等离子体纳米结构相互作用，但它们的性能受到TMDC多层中中性激子的低量子产率以及等离子体系统的大欧姆损耗的限制。在这里，我们展示了一种基于高量子产率WS单层中的三重子发射且与低损耗微光纤手性耦合的谷电子学系统。该集成系统利用波导模式的自旋特性实现谷激发的远程定向路由，还提供了一种从微光纤周围不同空间位置选择性寻址依赖谷的发射的方法。这种谷电子学界面可以与光纤通信设备集成，允许将谷极化和手性光子学合并作为经典和量子领域中光学信息传输和处理的替代机制。
