Welcome to the Department of Physics
At U Mass Boston

Greg Sun

I am Professor of Physics at U Mass Boston,
and Director of the Engineering Program.

Department of Physics
University of Massachusetts Boston
100 Morrissey Blvd.
Boston, MA , 02125 -3393

my office: S-3-116 phone: (617) 287-6432
email: greg.sun "at" umb.edu

The Engineering Program's Web Site

My Research Interests: Semiconductor optoelectronics and nanotechnology, quantum heterostructures, intersubband quantum processes.

Publications:

G. Sun , J. B. Khurgin, and R. A. Soref, “ Design of a GaN/AlGaN intersubband Raman laser electrically tunable over the 3~5 μm atmospheric transmission window,” J. Appl. Phys. 99 , 33103 (2006)
G. Sun , J. B. Khurgin, and R. A. Soref, “Nonlinear all-optical GaN/AlGaN multi-quantum-well devices for 100 Gb/s applications at λ = 1.55 m m,” Appl. Phys. Lett. 87 , 201108 (2005)
G. Sun and R. A. Soref, “Design and simulation of a GaN/AlGaN quantum cascade laser for terahertz emission,” Microelectronics Journal 36, 450 (2005)
G. Sun , R. A. Soref, and J. B. Khurgin, “A comparative study of InAs quantum dot lasers with barriers of direct and indirect bandgaps,” Microelectronics Journal 36, 183 (2005)
G. Sun and R. A. 0Soref, “Active region design of a terahertz GaN/Al_.15Ga_0.85N quantum cascade lasers,” Superlattices and Microstructures 37, 107 (2005)
G. Sun , R. A. Soref, and J. B. Khurgin, “ The linewidth enhancement factor α in quantum dot lasers with a short period superlattice of indirect bandgap ,” IEEE Photonics Technology Lett. 16, 2203 (2004)
G. Sun , R. A. Soref, and J. B. Khurgin, “Reduced threshold current of a quantum dot laser in short period superlattice of indirect-band gap,” Appl. Phys. Lett. 84, 3861 (2004)
G. Sun and R. A. Soref, “Si-based quantum staircase Terahertz lasers,” Microelectronics Journal 34 , 391 (2003)
G. Sun , R. A. Soref, and Z. Ikonic, “Promising SiGe superlattice and quantum well laser candidates,” in Towards the First Silicon Laser (Edited by L. Pavesi et al., Kluwer Academic Publishers, Netherlands, 2003), pp.293-306
R. A. Soref and G. Sun, “Terahertz gain in SiGe/Si quantum staircase utilizing the heavy-hole inverted effective mass,” Appl. Phys. Lett. 79, 3639 (2001)
G. Sun and Richard Soref, “Phonon–pumped terahertz gain in n-type GaAs/AlGaAs superlattice,” Appl. Phys. Lett. 78, 3520 (2001)
G. Sun , R. A. Soref, and J. B. Khurgin, “Phonon-pumped terahertz inter-miniband laser,”IEEE J. Selected Topics in Quantum Electron. 7, 376 (2001)
L. Friedman, G. Sun, and R. A. Soref, “SiGe/Si THz laser based on transitions between inverted mass light-hole and heavy-hole subbands,” Appl. Phys. Lett. 78, 401 (2001)
G. Sun , L. Friedman, and R. A. Soref, “Light-hole to heavy-hole acoustic phonon scattering rate,” Phys. Rev. B15, 12 , 8114 (2000)
L. Friedman, R. A. Soref, G. Sun, and Y. Lu, “Asymmetric strained-symmetrized Ge/Si interminiband laser,” IEEE Photonics Technology Letters 10, 1715 (1998)
L. Friedman, R. A. Soref, G. Sun, and Y. Lu, “Theory of the strain-symmetrized Si-based Ge/Si superlattice laser,” IEEE J. Selected Topics in Quantum Electron. 4 , 1029 (1998)
R. A. Soref, L. Friedman, L. C. Lew Yan Voon, L. R. Ram-Mohan, and G. Sun, “Progress toward silicon-based intersubband lasers,” J. Vac. Sci. Technol. B 16(3), 1525 (1998)
G. Sun , Y. Lu, and J. B. Khurgin, “ Valence intersubband lasers with inverted light-hole effective mass,” Appl. Phys. Lett. 72, 1481 (1998)
G. Sun , Y. Lu, and J. B. Khurgin, “Intersubband laser based on the subband dispersion of inverted mass,” the focus issue of Optics Express for Quantum Well Laser Design 2, 143 (1998)
G. Sun , Y. Lu, L. Friedman, and R. A. Soref, “Heavy-hole intersubband scattering by confined optical phonons in a Si/ZnS superlattice,” Phys. Rev. B 57, 6550 (1998)
L. Friedman, R. A. Soref, and G. Sun, “Silicon-based interminiband infrared laser,” J. Appl. Phys. 83, 3480 (1998)
R. A. Soref, L. Friedman, and G. Sun, “Silicon intersubband lasers,” Superlattices and Microstructures 23, 427 (1998)
G. Sun , Y. Lu, and J. B. Khurgin, “THz intersubband lasers using the inverted mass scheme,” in Intersubband Transitions in Quantum Wells: Physics and Devices, (Edited by S. S. Li and Y.-K. Su, Kluwer Academic Publishers, Boston, 1998), pp.167-172
G. Sun , J. B. Khurgin, L. Friedman and R. A. Soref, “Tunable intersubband Raman laser in GaAs/AlGaAs multiple quantum wells,” J. Opt. Soc. Am. B 15, 648 (1998)
G. Sun and J. B. Khurgin, “Electron Raman infrared laser based on intersubband transitions in coupled quantum wells,” in Narrow Gap Semiconductors , (Edited by S. C. Shen, D. Y. Tang, G. Z. Zheng, and G. Bauer, World Scientific, Singapore, 1998), pp.218-222
G. Sun , L. Friedman, and R. A. Soref, “Intersubband lasing in silicon-based quantum well structures,” Superlattices and Microstructures 22, 3 (1997)
L. Friedman, R. A. Soref, and G. Sun, “Quantum parallel laser: a unipolar superlattice intersubband laser,” IEEE Photonics Technology Letters 9, 593 (1997)
G. Sun and L. Friedman, “Heavy-hole scattering by confined nonpolar optical phonons in a single Si_{1- x}Ge_x/Si quantum well,” Phys. Rev. B 53, 3966 (1996)
J. Khurgin, G. Sun, L. Friedman, and R. A. Soref, “Comparative analysis of optically-pumped intersubband lasers and intersubband Raman Oscillators,” J. Appl. Phys. 78, 7398 (1995)
G. Sun , L. Friedman, and R. A. Soref, “Intersubband lasing lifetimes of SiGe/Si and GaAs/AlGaAs multiple quantum well structures,” Appl. Phys. Lett. 66, 3425 (1995)
G. Sun and L. Friedman, “Nonparabolicity corrections to the valence band energy levels of Si/Ge_xSi_1-xquantum wells,” Superlattices and Microstructures 17, 245 (1995)
G. Sun and J, Khurgin, “Optically pumped four-level infrared laser based on intersubband transitions in multiple quantum wells: feasibility study,” IEEE J. Quantum Electron. QE-29, 1104 (1993)
G. Sun and J. Khurgin, “Feasibility of optically pumped four-level infrared lasers,” in Intersubband Transitions in Quantum Wells, (Edited by E. Rosencher, B. Vinter, and B. Levine, Plenum Press, New York, 1992), pp.219-226
G. Sun , K. Shahzad, J. Gaines, and J. Khurgin, “Room-temperature photopumped blue lasing in ZnSe/ZnS_0.06Se_0.94 double heterostructures,” Appl. Phys. Lett. 59, 310 (1991)