Influence of interface roughness in quantum cascade lasers

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Abstract

We use a numerical model based on non-equilibrium Green's functions to investigate the influence of interface roughness (IFR) scattering in terahertz quantum cascade lasers. We confirm that IFR is an important phenomenon that affects both current and gain. The simulations indicate that IFR causes a leakage current that transfers electrons from the upper to the lower laser state. In certain cases, this current can greatly reduce gain. In addition, individual interfaces and their impact on the renormalized single particle energies are studied and shown to give both blue-and red-shifts of the gain spectrum. (C) 2015 AIP Publishing LLC.

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  • Atom and Molecular Physics and Optics
Original languageEnglish
Article number114501
JournalJournal of Applied Physics
Volume118
Issue number11
StatePublished - 2015
Publication categoryResearch
Peer-reviewedYes

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Martin Franckie

2012/05/202016/05/13

Project: DissertationIndividual research project

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