Next Article in Journal
Effective Linewidth of Semiconductor Lasers for Coherent Optical Data Links
Next Article in Special Issue
Engineering Multi-Section Quantum Cascade Lasers for Broadband Tuning
Previous Article in Journal
Two-Stage n-PSK Partitioning Carrier Phase Recovery Scheme for Circular mQAM Coherent Optical Systems
Previous Article in Special Issue
Heterogeneously Integrated Distributed Feedback Quantum Cascade Lasers on Silicon
Article Menu

Export Article

Open AccessArticle
Photonics 2016, 3(2), 38; doi:10.3390/photonics3020038

Quantum Transport Simulation of High-Power 4.6-μm Quantum Cascade Lasers

Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
*
Authors to whom correspondence should be addressed.
Received: 4 May 2016 / Revised: 5 June 2016 / Accepted: 7 June 2016 / Published: 10 June 2016
(This article belongs to the Special Issue Quantum Cascade Lasers - Advances and New Applications)
View Full-Text   |   Download PDF [640 KB, uploaded 16 June 2016]   |  

Abstract

We present a quantum transport simulation of a 4.6- μ m quantum cascade laser (QCL) operating at high power near room temperature. The simulation is based on a rigorous density-matrix-based formalism, in which the evolution of the single-electron density matrix follows a Markovian master equation in the presence of applied electric field and relevant scattering mechanisms. We show that it is important to allow for both position-dependent effective mass and for effective lowering of very thin barriers in order to obtain the band structure and the current-field characteristics comparable to experiment. Our calculations agree well with experiments over a wide range of temperatures. We predict a room-temperature threshold field of 62 . 5 kV/cm and a characteristic temperature for threshold-current-density variation of T 0 = 199 K . We also calculate electronic in-plane distributions, which are far from thermal, and show that subband electron temperatures can be hundreds to thousands of degrees higher than the heat sink. Finally, we emphasize the role of coherent tunneling current by looking at the size of coherences, the off-diagonal elements of the density matrix. At the design lasing field, efficient injection manifests itself in a large injector/upper lasing level coherence, which underscores the insufficiency of semiclassical techniques to address injection in QCLs. View Full-Text
Keywords: QCL; density matrix; midinfrared; phonons; quantum transport; simulation; superlattice QCL; density matrix; midinfrared; phonons; quantum transport; simulation; superlattice
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Jonasson, O.; Mei, S.; Karimi, F.; Kirch, J.; Botez, D.; Mawst, L.; Knezevic, I. Quantum Transport Simulation of High-Power 4.6-μm Quantum Cascade Lasers. Photonics 2016, 3, 38.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Photonics EISSN 2304-6732 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top