单层过渡金属硫化物为代表的二维半导体材料，具有直接带隙的能带结构、较大的激子束缚能和非等价的能谷特性，在多激子荧光发射、自旋-能谷耦合等方面展现了独特的光物理性质，对新型光电子功能器件应用具有重要意义。但由于超薄的尺寸厚度、有限的光吸收界面和苛刻的谷极化荧光激发条件，二维材料光与物质相互作用增强及有效调控亟待突破和解决。本项目以设计和加工制备手性等离激元纳米结构为解决方案，结合手性等离激元纳米结构特殊的近场模式、电磁场局域束缚增强、热电子掺杂等效应，探究等离激元-激子耦合机制、热电子转移对激子和三激子的影响、超手性电磁场模式对谷极化荧光的调控作用。基于光与物质耦合及调控机制的理解，探索偏振光调控的光子器件及室温操控的谷极化光子器件。借此项目的顺利展开，突破当前二维材料领域的重要科学难题，拓展二维材料在光电子功能器件的应用，提高我国新型光子信息器件研究的国际影响力及原创力。

Monolayer transition metal dichalcogenides are typical two-dimensional (2D) semiconductors with direct band gap, large exciton binding energy and inequivalent valleys, which shows unique light-matter properties involving multi-excitonic photoluminescence (PL) and spin-valley couplings. The development of 2D semiconductors plays a significant role in the applications of functional optoelectronic devices. However, the investigation of 2D materials faces great challenges in enhancing and tailoring the light-matter interactions, due to the limitations of their ultra-thin thickness, small absorption cross-section and harsh excitation conditions of valley polarization PL. This project is intended to design and fabricate chiral plasmonic nanostructure to induce the plasmonic effects, among unique near-field modes, local-confined electromagnetic enhancement and hot electrons doping, helping to study the mechanism of plasmon-exciton coupling, charge transfer induced multi-excitons transform and superchiral modes tailored valley polarization PL. Based on the understanding of mechanism on light-mater interactions and manipulations, the polarized light controlled photonic heterostructures and room-temperature realized valley polaritonic devices are further to be explored. This project not only makes a big breakthrough on the advanced scientific problems of 2D materials, but also expands the research field of novel 2D optoelectronic devices, which would help to increase the international influence power and innovative ability of China in 2D materials research areas.