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[Seminar]-Prof.Sun Handong-Nanyang Technological University
Time:2015-03-04 10:14Source:未知 Author :Zhang shengli Click:
Time:       03/05/2015 10:00 AM           
Location:   building 340 room 201
Speaker:   Handong Sun Nanyang Technology University
Title:     Lasing and Applications of Flexible Optical Micro-Resonators
Inviter:     Haibo Zeng
Sponsor:   Institute of Optoelectronics and Nanomaterials

Abstract: Optical microresonators have attracted intensive attention due to their importance in practical applications as well as of fundamental physics interest in light-matter interaction. The optical confinement provided by a microcavity enhances greatly the coupling between optical spatial mode and the matter inside. Conventional fabrication of micro-cavities adopting semiconductor processing technology through either top-down or bottom-up approaches still faces some challenges. In this talk, the feasibility of constructing solid state microcavities with various configurations like spheres, hemispheres and fibres in a flexible way will be demonstrated.  We realize optically pumped lasing from these structures after loading gain materials. The optical modes are well defined by WGM lasing. We have demonstrated single-frequency operation in both spheres and fibres with reduced sizes. We are also able to tune the lasing by deforming the shape of micro-spheres, which represents the convenient manipulation of light matter interaction. Refractive index sensing with high sensitivity can be readily realized from these structures enabled by the existence of evanescent waves. Finally I will present our recent results about stimulated emission and lasing realized from colloidal quantum dots.

Bio: Dr. SUN Handong
Dr Sun Handong is currently working as an Associate Professor in the School of Physical & Mathematical Sciences, Nanyang Technological University (NTU), Singapore. He received his Bachelor degree in Physics from Dalian University of Technology, Master and Ph.D. degrees from Huazhong University of Science & Technology, and Hong Kong University of Science & Technology, respectively. Before joining NTU, he did postdoctoral research works at RIKEN, Japan and Institute of Photonics, The University of Strathclyde, UK. His research theme exists at the interface between optical physics and material science, i.e. light-matter interaction. His current research work is focused on Optical spectroscopic characterization, Optoelectronic Devices, Plasmonics Optics and Applications of Photonics.
(Editor:Zhang shengli)