Sanjay Krishna's Research Group at CHTM

Technical Overview. We are investigating type I InGaSb MWIR lasers and detectors. This is a continuation of preliminary work undertaken by one of Prof. Lester’s students and Dr. Dawson. They demonstrated room temperature optically pumped lasers at 3 mm using metamorphic buffer layers. We are extending this work to electrically injected lasers and are presently undertaking studies on dopant incorporation in these material systems. We have also reported room temperature MWIR detectors using a similar metamorphic buffer layer and are working on optically pumped vertical cavity surface emitting lasers (VCSELs).

Funding for this work has been provided by the Missile Defense Agency.

Personnel. Prof. Dawson, Paul Rotella, Ravi Kalyanam, Yaxin Yu and Rajeev Shenoi

Collaborators. Prof. Huffaker (UNM) and Dr. J.R. Meyer (NRL);

Selected Publications.
P. Hill, N. Weisse-Bernstein, L. R. Dawson, P. Dowd, and S. Krishna, “Activation energies for Te and Be in metamorphically grown AlSb and InxAl1–xSb layers”, Appl. Phys. Lett. 87, 092105 (2005).

G. Balakrishnan, S.H. Huang, A. Khoshakhlagh, P. Hill, A. Amtout, S. Krishna, G.P. Donati, L.R. Dawson and D.L. Huffaker, “Room-temperature optically-pumped InGaSb quantum well lasers monolithically grown on Si(100) substrate”, IEE Electronics Letters, Vol. 41, No. 9, pg 531, 2005.