Sushil Kumar

Assistant Professor of Electrical & Computer Engineering

PhD Electrical Engineering, Massachusetts Institute of Technology 2007
MS  Electrical Engineering, University of Michigan 2001
BE  Electronics and Communications, Delhi College of Engineering, India 1998

Contact Information:
Sinclair Laboratory
Room 226D
Center for Optical Technologies
7 Asa Drive, Bethlehem, PA 18015
Phone: (610) 758-2606
Email: sushil(at)lehigh(dot)edu

Research Interests:
Intersubband semiconductor lasers (quantum-cascade lasers) and detectors, terahertz technology, silicon photonics, plasmonics, quantum electronics

Representative Publications:

A 1.8 THz quantum-cascade laser operating significantly above the temperature of hν/k
Sushil Kumar, Chun W. I. Chan, Qing Hu, and John L. Reno
Nature Physics, 2010, doi: 10.1038/nphys1846
http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys1846.html

Recent progress in terahertz quantum cascade lasers
Sushil Kumar
IEEE Journal of Selected Topics in Quantum Electronics, DOI: 10.1109/JSTQE.2010.2049735 (2010) (invited)
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5491037

Coherence of resonant-tunneling transport in terahertz quantum-cascade lasers
Sushil Kumar and Qing Hu
Physical Review B 80, 245316 (2009)
http://link.aps.org/doi/10.1103/PhysRevB.80.245316

Tuning a terahertz wire laser
Qi Qin, Benjamin S. Williams, Sushil Kumar, John L. Reno, and Qing Hu
Nature Photonics 3, 732 (2009)
http://www.nature.com/nphoton/journal/v3/n12/abs/nphoton.2009.218.html

186 K operation of terahertz quantum-cascade lasers based on a diagonal design
Sushil Kumar, Qing Hu, and John L. Reno
Applied Physics Letters 94, 131105 (2009)
http://link.aip.org/link/?APPLAB/94/131105/1

Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides
Sushil Kumar, Benjamin S. Williams, Qi Qin, Alan W. Lee, Qing Hu, and John L. Reno
Optics Express 15, 113 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-1-113

Continuous-wave operation of terahertz quantum-cascade lasers above liquid-nitrogen temperature
Applied Physics Letters 84, 2494 (2004)
http://apl.aip.org/resource/1/applab/v84/i14/p2494_s1