Title:  Is nitride a solution for compact, room temperature THz laser?

Speaker: Greg Sun，Professor, University of Massachusetts Boston

Time: June 23,2014,10:00AM

Venue:Academic Conference Center, IOS, CAS 

摘要: The THz spectral range (λ=30-300 μm) is interesting for spectroscopy and imaging applications. However, the scope of these applications is limited to a large extent by the availability of THz sources which typically either are very bulky in size or require cryogenic cooling. Quantum cascade lasers (QCLs) relying on intersubband transitions in semiconductor quantum wells (QWs) as compact THz sources have penetrated deep into THz range, but their operating temperature has managed to increase to only 200K after more than a decade of development. There is a reason to believe that further increase to room temperature is unlikely with the ubiquitous GaAs material system currently employed in the THz QCLs. In this talk, I will bring forth and evaluate the idea of developing GaN-based QCL as a THz source that can potentially be operating at room temperature.

报告人：Greg Sun received his B.S. in Microelectronics from Peking University in 1984, M.S. in Electrical Engineering from Marquette University in 1988, and Ph.D. in Electrical Engineering from Johns Hopkins University in 1993. Since then, he joined the faculty at the University of Massachusetts Boston as a faculty.  Prior to that from 1990 to1992, he worked as a research fellow at Philips Laboratories, Briarcliff Manor, New York, conducting research on ZnSe-based blue lasers. Currently, he is a full professor in Electrical Engineering, and serves as the Director of the Engineering Program at UMass Boston where he is leading the effort to establish the Department of Engineering. His research efforts focus on theoretical investigations in semiconductor optoelectronics and nanophotonics. He has published about 100 papers in refereed journals. He has delivered over 90 invited and contributed conference papers, and given over 30 seminars and colloquia. He serves on various conference committees and on the editorial board of a technical journal.