Self-Consistent Rate Equation Modelling of a Terahertz GaAs/AlGaAs Quantum-Cascade Laser

D. Indjin, P. Harrison, R. W. Kelsall, Z. Ikonić

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


In this work, electron transport in GaAs/AlGaAs quantum cascade lasers operating at far-infrared wavelengths is calculated self-consistently using an intersubband scattering model. Subband populations and carrier transition rates are calculated and all relevant electron-electron and electron-LO phonon scatterings between the injector/collector and active region levels (13-levels in total) are included. Employing an energy balance equation which includes the influence of both electron-LO phonon and electron-electron scattering, the method also includes the evaluation of the electron temperature of the non-equilibrium carrier distributions in the device. The calculated threshold currents (Jth = 250-300 kA/cm2) and electric field-current density characteristics (current saturation is predicted at ∼680 A/cm2), are in good qualitative and quantitative agreement with measurements in a recent experimental realization (Kohler et al, Nature, vol. 417, pp. 156-159, 2002). Due to the increased influence on electron-electron scatterings, the electron temperature is found to be more sensitive to the current density than in mid-infrared devices. The technique promises to be a powerful tool for the optimization of new, improved Terahertz quantum cascade lasers.

Original languageEnglish
Title of host publicationIEEE 10th International Conference on Terahertz Electronics, Proceedings
Subtitle of host publicationTHz 2002
EditorsJ M Chamberlain, A G Davies, P Harrison, E H Linfield, R E Miles, S Withington
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Print)0780376307
Publication statusPublished - 7 Nov 2002
Externally publishedYes
Event10th IEEE International Conference on Terahertz Electronics - Cambridge, United Kingdom
Duration: 9 Sep 200210 Sep 2002
Conference number: 10


Conference10th IEEE International Conference on Terahertz Electronics
Abbreviated titleTHz 2002
Country/TerritoryUnited Kingdom


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