Impact of interface roughness distributions on the operation of quantum cascade lasers

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DOIResolve DOI: http://doi.org/10.1364/OE.23.005201
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TypeArticle
Journal titleOptics Express
ISSN1094-4087
Volume23
Issue4
Pages5201
AbstractWe 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.
Publication date
PublisherOptical Society of America
LanguageEnglish
AffiliationInformation and Communication Technologies; National Research Council Canada
Peer reviewedYes
NPARC number23001504
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Record identifier88da9364-8edf-42ed-8850-7ff1479b8962
Record created2017-02-20
Record modified2017-02-20
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