Seminar by Prof Xiao 'Ultrahigh-Q optical microcavity optics and photonics'

Speaker:
Dr Yun-Feng Xiao
Associate Professor, State Key Laboratory for Artificial MicroStructre and Mesoscopic Physics, School of Physics, Peking University

Seminar Title:
Ultrahigh-Q optical microcavity optics and photonics

Abstract:
Confinement and manipulation of photons using microcavities have triggered intense research interest in both fundamental and applied photonics for more than one decade. Prominent examples are ultrahigh-Q whispering gallery microcavities which confine photons by means of continuous total internal reflection along a curved and smooth surface. The long photon lifetime, strong field confinement, and in-plane emission characteristics make them promising candidates for enhancing light-matter interactions on a chip. In the first part of this talk, I will introduce some representative photonics applications of ultrahigh-Q microcavities, such as ultralow-threshold microlasing (microcomb), cavity quantum electrodynamics, cavity optomechanics, and highly sensitive optical sensing. In the second part, I will focus on the single-nanoparticle detection by using whispering gallery microcavities, which is highly desirable for applications in various fields, such as in early-stage diagnosis of human diseases and in environmental monitoring.

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.Yong-Chun Liu, Xingsheng Luan, Hao-Kun Li, Qihuang Gong, Chee Wei Wong, and Yun-Feng Xiao, "Coherent polariton dynamics in coupled highly-dissipative cavity quantum electrodynamics," Phys. Rev. Lett. 112(21), 213602 (2014).
3.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
4.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

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 2000 citations, and has delivered over 50 invited talks/seminars in international/national conferences.