Fingerprints of spatial charge transfer in quantum cascade lasers

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NELANDER, R., WACKER, A., PEREIRA, M. F., REVIN, D. G., SOULBY, M. R., WILSON, L. R., COCKBURN, J. W., KRYSA, A. B., ROBERTS, J. S. and AIREY, R. J. (2007). Fingerprints of spatial charge transfer in quantum cascade lasers. JOURNAL OF APPLIED PHYSICS, 102 (11). [Article]

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Abstract

We show that mid-infrared transmission spectroscopy of a quantum cascade laser provides clear-cut information on changes in charge location at different bias. Theoretical simulations of the evolution of the gain/absorption spectrum for a lambda similar to 7.4 mu m InGaAs/AlInAs/InP quantum cascade laser have been compared with the experimental findings. Transfer of electrons between the ground states in the active region and the states in the injector goes hand in hand with a decrease of discrete intersubband absorption peaks and an increase of broad, high-energy absorption toward the continuum delocalized states above the barriers. (C) 2007 American Institute of Physics.

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Times Cited: 9

Research Institute, Centre or Group - Does NOT include content added after October 2018:

Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Electronic Materials and Sensors Research Group

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ORCID for M. F. Pereira: