报告人：王俊（中国科学院上海光学精密机械研究所）
报告时间：2016年4月14日（周四）上午 10:30
报告地点：图书馆中心会议室
报告内容：
Owing to the specific two-dimensional (2D) confinement of electron motion and the absence of interlayer perturbation, 2D semiconductors possess unique optoelectronic properties and has become a research hot-spot in recent years. Whereas the electronic and luminescent properties of 2D transition metal dichalcogenide (TMDC) nanosheets, say, MoS2, MoSe2, WS2, etc., have been generating much research interest, the ultrafast nonlinear optical (NLO) properties remain largely unexplored. Realized that the sizable and thickness-dependent bandgap offers TMDCs a huge potential in the development of photonic devices with high performance and unique functions, we studied extensively the ultrafast NLO property of a range of TMDC nanosheets. 2D TMDC nanosheets with high-quality layered nanosheets were prepared using liquid-phase exfoliation technique. Ultrafast saturable absorption, two-photon absorption, ultrafast nonlinear photoluminescence were observed from the 2D nanostructures. The exciting results open up the door to 2D photonic nano-devices, such as optical switches, pulse shaping devices, mode-lockers, optical limiters, etc., capable of ultrafast response and broadband tunability.
报告人简介：
王俊，中国科学院上海光学精密机械研究所，中科院强激光材料重点实验室副主任，研究员，博士生导师，香港中文大学博士，爱尔兰都柏林圣三一大学博士后。主要研究二维纳米非线性光学效应、材料和器件。在Prog. Mater. Sci.、Nature Nanotech., Adv. Mater., ACS Nano, Nature Commun., Laser&Photon. Rev., Nanocale等国际SCI期刊上发表论文80余篇，被Nature子刊等他引1200余次；国家自然科学基金委“优秀青年科学基金”、中科院“百人计划”、上海市“浦江人才计划”；近3年，在Nonlinear Photonics 2015、SPIE Photonics West 2015、Laser Optics 2014、NanoSMAT 2014等国际学术会议做邀请报告10余次；目前担任美国光学学会SCI杂志《Photonics Research》副主编之一、上海市激光学会理事及青年委员会主任。
