主题➛：应用超高品质因子光学微谐振腔的对单纳米粒子探测
主讲人： 北京大学副教授 肖云峰
时间：2015年9月7日（周一）下午15:00
地点：图文信息中心第二会议室
主持人： 张大伟 教授
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Abstract:
Detection of single nanoscale objects is highly desirable for applications in various fields, such as in early-stage diagnosis of human diseases and in environmental monitoring. High-Q microcavities, which can significantly enhance light-matter interactions, provide ideal platforms for label-free, ultrasensitive detection of single nano-objects. In this talk, we report theexperimental demonstration of single nanoparticle detection using either resonance modebroadening or microcavity Raman laser splitting. For the latter, by monitoring the step changes in beat frequency of the two split Raman mode lasing, detection of single 20-nm-radiusnanoparticles is realized in an aqueous environment. Since Raman scattering occurs in most materials under practically any pump wavelength, this split-mode Raman laser provides a more practical sensing platform.
摘要🦸🏻：
对单纳米粒子的探测技术在很多领域诸如人类疾病的早期诊断🏌🏿♀️，环境监测等都有广泛需求。高品质因子微谐振腔可以极大增强光和物质相互作用，能提供对单个纳米粒子，无标记和超高灵敏度检测环境。报告中会详细介绍用共振模式展宽或者微腔拉曼激光分离模式的方式进行单粒子探测实验🧏。利用双分离拉曼模式激光的拍频变化，在水溶环境下的直径20纳米单粒子可以探测到。大部分物质在任何激发光下会存在拉曼散射，因此该分离模式拉曼激光方法将会在探测领域有更多的实际应用𓀆𓀎。
Brief Bio:
Dr. Yun-Feng Xiao received the B.S. and Ph.D. degrees in physics from University of Science and Technology of China in 2002 and 2007, respectively. After a postdoctoral research at Washington University in St. Louis, he joined the faculty of Peking University in 2009, and was promoted to Associate Professor with tenure in 2014. During the past few years, he was awarded the Excellent Young Scientist by National Natural Science Foundation of China (NSFC) in 2012, The Rao Yutai First Prize in Fundamental Optics in 2013. His research interests lie in the fields of whispering-gallery microcavity optics and photonics. He has authored or co-authored more than 100 refereed journal papers with over 1800 citations, and has delivered over 60 invited talks/seminars in international/national conferences. Group URL: www.phy.pku.edu.cn/~yfxiao/
讲座人简介：
肖云峰在中科大物理系2002年获得本科学位，2007年获得博士学位，之后在华盛顿大学进行博士后研究工作。2009年加入北京大学，2014年被晋升为副教授。他2012年被国家自然科学基金评为优秀青年🎙，2013年获得饶毓泰基础光学一等奖。主要研究方向为whispering-gallery微谐振腔光学和光子学。近年来以第一作者和共同作者发表了超过100篇期刊文章，超过1800次被引用，在国际国内会议上参加了60次特邀报告。