▶ Towards a Single Quantum Dot Microdisk Laser ◀
◎ 일 시 : 2008년 5월 19일 월요일 11:00-12:00
◎ 장 소 : 서울대학교 반도체공동연구소 설계연구관 도연홀
◎ 연 사 : Glenn Solomon
(National Institute of Standards and Technologies, University of Maryland)
Ultra-low threshold lasers have applications in low-power communications, and emerging areas such as on-chip communications. At these very low thresholds our common understanding of lasing breakdowns because the lasing occurs via only a few emitters and the gain medium is therefore highly nonuniform. An excellent example is the one studied here, where the gain medium is a very dilute array of semiconductor quantum dots (QDs). In such a case, the turn-on of lasing is not expected to be abrupt; the typically knee in the laser L-I curve, often used to define a threshold, will be transformed into a soft transition.
After a general introduction to the fabrication and optical properties of semiconductor QDs, I will discuss an ultra-low, sub-µW threshold microcavity laser. The QDs are InAs based, and the cavity is formed in a microdisk of GaAs. On average less than one QD spectrally and spatially aligned with a cavity mode.
Dr. Glenn S. Solomon received his B.S. and M.S. degree in Materials Science and Mechanical Engineering from Duke University, and Ph.D. degree in Materials Science Engineering from Stanford University. From 1984 to 1989, he worked as a research engineer at Research Triangle Institute. From 1996 to 1998, he was a Research Associate at Ginzton Laboratory, Stanford University. In 1997, he founded CBL Technologies and has been the President and CEO of the company. From 1999 to 2005, he was a Senior Research Associate/Acting Assistant Professor at Dept. of Electrical Engineering, Stanford University. He is a Physicist at Physics Laboratory, National Institute of Standards and Technologies. He is also a Consulting Associate Professor at Stanford University, an Adjunct Professor of Physics at the University of Maryland, and a founding Fellow at the Joint Quantum Institute.
His current research is focused on semiconductor-based quantum optics (cavity QED with discrete quantum dot states and microcavities, optical processes and control in single quantum dots) and crystal growth and fabrication in III-V compound semiconductors. He has authored and co-authored 83 publications in journals/ conferences/book chapters.
담당교수 : 전기컴퓨터공학부 박병국 (문의 : 이현유, Tel. 880-1797 )