Title：Ultra-high-Q asymmetric microcavity optics and photonics

Speaker：Prof.Yun-Feng Xiao

Host：Prof. Jian Wu

Time：09:00 am, December 13, 2017

Venue：Room A814, Science Building, ECNU Zhongbei Campus

Biography：

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 a tenured professor with in 2014. His research interests lie in the fields of whispering-gallery microcavity optics and photonics. He has authored or co-authored more than 130 refereed journal papers with over 3000 citations, and has delivered over 100 pleanry/keynote/invited talks/seminars in international/national conferences/universities.

Abstract of the talk：

Confinement and manipulation of photons using microcavities have triggered intense research interest in both fundamental and applied photonics for more than two decades. 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. In the second part, I will focuse on a new type of on-chip whispering gallery microcavity which supports both highly asymmetric far-field patterns and ultra-high-Q factors exceeding 100 million. These microcavities not only offer highly directional emission desired for various important application, but also hold great potential to test classical and quantum chaos because they behave like open billiard systems.