Rough Interfaces in THz Quantum Cascade lasers
Abstract
The impact of interface roughness scattering on the device performance of state-of-the-art THz quantum cascade lasers is theoretically analyzed using the non-equilibrium Green’s function formalism. It is shown that for a particular direct transition QCL design style rough interfaces hardly change the electronic energy spectrum, but dramatically reduce the occupation inversion and the optical gain. A spatial separation leading to a diagonal transition laser, leads in contrast to a limited sensitivity to interface roughness. Diagonal transition QCL designs result in a better device performance and an improved reliability with respect to interface roughness induced by growth quality variations.
Keywords
quantum cascade laser, nonequilibrium Green’s functions, charge transport theory
Date of this Version
10-2010
Recommended Citation
Kubis, Tillmann and Klimeck, Gerhard, "Rough Interfaces in THz Quantum Cascade lasers" (2010). Birck and NCN Publications. Paper 716.
https://docs.lib.purdue.edu/nanopub/716
Comments
International Workshop for Computational Electronics, (2010, Pages 1-4, Pisa Iraly