Journal
OPTICS EXPRESS
Volume 23, Issue 4, Pages 5201-5212Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.005201
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Funding
- European Union Seventh Framework Programme (FP7) [317884]
- collaborative Integrated Project MIRIFISENS
- Swedish Research Council (VR)
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We study the impact of interface roughness on the operation of mid-IR and THz quantum cascade lasers. Particular emphasis is given towards the differences between the Gaussian and exponential roughness distribution functions, for which we present results from simulation packages based on nonequilibrium Green's functions and density matrices. The Gaussian distribution suppresses scattering at high momentum transfer which enhances the lifetime of the upper laser level in mid-IR lasers. For THz lasers, a broader range of scattering transitions is of relevance, which is sensitive to the entire profile of the interface fluctuations. Furthermore we discuss the implementation of interface roughness within a two band model. (C) 2015 Optical Society of America
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