Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations

Agnew, G., Grier, A., Taimre, T, Lim, Y. L., Nikolic, M, Valavanis, A., Cooper, J., Dean, P., Khanna, S. P., Lachab, M., Linfield, E. H., Davies, A. G., Harrison, P., Ikonic, Z., Indjin, D. and Rakic, A. D. (2015) Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations. Applied Physics Letters, 106 16: 161105-1-161105-4. doi:10.1063/1.4918993

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Author Agnew, G.
Grier, A.
Taimre, T
Lim, Y. L.
Nikolic, M
Valavanis, A.
Cooper, J.
Dean, P.
Khanna, S. P.
Lachab, M.
Linfield, E. H.
Davies, A. G.
Harrison, P.
Ikonic, Z.
Indjin, D.
Rakic, A. D.
Title Efficient prediction of terahertz quantum cascade laser dynamics from steady-state simulations
Journal name Applied Physics Letters   Check publisher's open access policy
ISSN 0003-6951
Publication date 2015-04-22
Year available 2015
Sub-type Article (original research)
DOI 10.1063/1.4918993
Open Access Status File (Publisher version)
Volume 106
Issue 16
Start page 161105-1
End page 161105-4
Total pages 4
Place of publication Melville, NY United States
Publisher AIP Publishing
Collection year 2016
Language eng
Abstract Terahertz-frequency quantum cascade lasers (THz QCLs) based on bound-to-continuum active regions are difficult to model owing to their large number of quantum states. We present a computationally efficient reduced rate equation (RE) model that reproduces the experimentally observed variation of THz power with respect to drive current and heat-sink temperature. We also present dynamic (time-domain) simulations under a range of drive currents and predict an increase in modulation bandwidth as the current approaches the peak of the light–current curve, as observed experimentally in mid-infrared QCLs. We account for temperature and bias dependence of the carrier lifetimes, gain, and injection efficiency, calculated from a full rate equation model. The temperature dependence of the simulated threshold current, emitted power, and cut-off current are thus all reproduced accurately with only one fitting parameter, the interface roughness, in the full REs. We propose that the model could therefore be used for rapid dynamical simulation of QCL designs.
Keyword Terahertz quantum cascae laser
Rate equation model
Static and dynamic behaviour
Rate equation parameters
Free space communication
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
School of Information Technology and Electrical Engineering Publications
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Citation counts: TR Web of Science Citation Count  Cited 4 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 27 Apr 2015, 17:29:01 EST by Gary Agnew on behalf of School of Information Technol and Elec Engineering