Affiliation: | (1) Department of Physics, North Carolina State University, 27695-8202 Raleigh, NC;(2) Present address: Laser Diode Laboratory, Samsung Advanced Institute of Technology, P.O. Box 111, 440-600 Suwon, South Korea;(3) Department of Electrical and Computer Engineering, North Carolina State University, 27695-7911 Raleigh, NC |