报告人： 王俊 研究员
邀请人： 张大伟 教授
报告题目：Nonlinear Optical Effects in Layered 2D Semiconductors
（层状二维半导体的非线性光学效应）
报告时间：2017年3月10日 上午9：30
报告地点：光电大楼一楼报告厅
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.等国际SCI期刊上发表论文100余篇，含7篇ESI论文，被Nature子刊等引用2000余次，单篇最高引用200余次；入选国家首批“万人计划—青年拔尖人才”、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“优秀学术带头人”、2015年度上海市青年五四奖章标兵、中科院上海分院“第五届杰出青年科技创新人才”；近年，在ICFPAM 2016、Laser Optics 2016、NPO 2016、Nonlinear Photonics 2015、SPIE Photonics West 2015等国际学术会议做邀请报告20余次；曾担任科技部、教育部、上海市科委项目会评专家；目前担任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；作为项目负责人，主持中组部、基金委、中科院、上海市科委等项目。
报告简介：
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.