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

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

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

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • ETH Zürich
  • National Research Council of Canada
  • III-V Lab, 1 Avenue Augustin Fresnel, 91767 Palaiseau
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Atom- och molekylfysik och optik
Originalspråkengelska
Sidor (från-till)5201-5212
TidskriftOptics Express
Volym23
Utgåva nummer4
StatusPublished - 2015
PublikationskategoriForskning
Peer review utfördJa

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