Abstract： Strong coupling between light and exciton forms polaritons with half-light half-matter character, holding potential for low-threshold polariton laser, long range coherent energy transfer, and modification of chemical reaction properties, etc. Understanding ultrafast carrier dynamics, particularly coherent light-matter energy exchange, is crucial in advancing the application of polaritons. Metal nanostructures supporting surface plasmon resonances offer a versatile platform for exploring strong exciton-plasmon coupling. Coherent plasmon-exciton coupling was probed by ultrafast two-dimensional electronic spectroscopy. We also demonstrate that periodic plasmonic nanostructure can be a good test bed to coupling with molecular excitons. Particularly, resonance parameters of the plasmon modes, including linewidth and resonance strength, can be flexibly manipulated to tailor the transport properties of polaritons. Furthermore, cavity-free polaritons (no external cavity) has the benefit of easy fabrication. We use ultrafast spectroscopy to study the carrier dynamics of a self-hybridized polaritons in WSe2 thin films, revealing exciton-polariton scattering and relaxation of carriers.

主讲人简介

钟锦辉，南方科技大学材料科学与工程系研究员，国家级高层次青年人才，博士生导师。2010年本科毕业于中山大学，2016年博士毕业于厦门大学（导师：任斌教授），2017-2022年在德国奥尔登堡大学开展博士后研究（洪堡学者，合作导师Christoph Lienau教授）。研究兴趣为先进光谱学方法的发展及应用，包括超高空间分辨（针尖增强拉曼光谱、扫描近场光学显微镜）和超高时间分辨（干涉、泵浦-探测、二维电子光谱）等光谱学方法，及其在光电催化、光电信息等材料研究中的应用，致力于在原子分子水平、飞秒时间尺度研究功能材料的构效关系，为新材料的创制提供基础。近期研究兴趣为光-物质强耦合作用的超快动力学及其对物质性质的调控机理研究。研究论文以第一或通讯作者发表在Nature Nanotech., Nature Commun., J. Am. Chem. Soc., Angew. Chem. Int. Ed.，ACS Nano, Nano Lett.等期刊。主持国家自然科学基金国际合作项目、面上项目，国家重点研发计划课题。