报告地点：物理学院新楼多功能厅

报告人：北京大学 Dr. Yun-Feng Xiao

邀请人：徐红星教授

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 the experimental demonstration of single nanoparticle detection using either resonance mode broadening 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-radius nanoparticles 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.

References

1. Bei-Bei Li, William R. Clements, Xiao-Chong Yu, Kebin Shi, Qihuang Gong, and Yun-Feng Xiao, "Single nanoparticle detection using split-mode microcavity Raman lasers," PNAS 111(41), 14657-14662 (2014).

2. Linbo Shao, Xue-Feng Jiang, Xiao-Chong Yu, Bei-Bei Li, William R. Clements, Frank Vollmer, Wei Wang, Yun-Feng Xiao, and Qihuang Gong, "Detection of Single Nanoparticles and Lentiviruses Using Microcavity Resonance Broadening," Advanced Materials 25(39), 5616-5620 (2013). Frontispiece paper

3. Xiao-Chong Yu, Bei-Bei Li, Pan Wang, Limin Tong, Xue-Feng Jiang, Yan Li, Qihuang Gong, and Yun-Feng Xiao, "Single Nanoparticle Detection and Sizing Using a Nanofiber Pair in Aqueous Environment," Advanced Materials 26(44), 7462-7467 (2014). Front cover paper

报告人简介：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 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 1600 citations, and has delivered over 50 invited talks/seminars in international/national conferences. Group URL:www.phy.pku.edu.cn/~yfxiao/