세미나 제목: Optomechanics, Acousto-optics and 2D Materials Integrated with Silicon Photonics

연사: Prof. Mo Li, Department of Electrical and Computer Engineering, University of Minnesota

일시: 2016년 6얼 8일 오전 11시

장소: 301동 1121호

Abstract

Research of silicon photonics has already advanced to development lead by the semiconductor industry aiming to build low-power inter-chip and intra-chip optical interconnect for high performance computing utilizing a total bandwidth of many Tbits/sec. On the other hand, in research laboratories, integrated silicon photonic circuits provide high performance optical platform enabling on-chip exploration of novel light-matter interactions. In this talk, I will showcase several examples of my group’s research in using silicon photonic chips as the underlying optical breadboard to study new optical physics and materials. First, we demonstrate a cavity optomechanical system that can mechanically shuttle photons between distant cavities and measure spin angular momentum of light. Second, we show the integration of surface acoustic waves devices operating at unprecedentedly high frequency up to 20 GHz with nanophotonic cavities, and strong acousto-optic modulation enabled by co-confinement of light and sound waves. Finally, a recently emerged two-dimensional material, black phosphors (also called phosphorene), is integrated on silicon photonics to achieve efficient and high speed photodetection of infrared light, enabled by black phosphorus’ direct and narrow bandgap. Black phosphorus’ novel nonlinear optical properties are also revealed with third harmonic generation measurement.

Biography:

Mo Li is an Associate Professor in the Department of Electrical and Computer Engineering at the University of Minnesota. From 2007 to 2010, he was a postdoctoral associate in Department of Electrical Engineering at Yale University. He received his Ph.D. degree in Applied Physics from Caltech in 2007. He won NSF CAREER Award in 2014, McKnight Land-Grant Professorship of UMN in 2013 and AFOSR Young Investigator Award in 2012. His current research areas are nanophotonics, nano-optomechanical systems (NOMS), 2D material optoelectronics, opto-spintronics and quantum photonics.