Detail publikace

Barrier Height Tuning of Terahertz Quantum Cascade Lasers for High-Temperature Operation

KAINZ, M. SCHÖNHUBER, S. ANDREWS, A. DETZ, H. STRASSER, G. UNTERRAINER, K.

Originální název

Barrier Height Tuning of Terahertz Quantum Cascade Lasers for High-Temperature Operation

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Terahertz quantum cascade lasers (QCLs) are excellent coherent light sources, but are still limited to an operating temperature below 200 K. To tackle this, we analyze the influence of the barrier height for the identical three-well terahertz QCL layer sequence by comparing different aluminum concentrations (x = 0.12-0.24) in the GaAs/AlxGa1-xAs material system, and then we present an optimized structure based on these findings. Electron injection and extraction mechanisms as well as LO-phonon depopulation processes play crucial roles in the efficient operation of these lasers and are investigated in this study. Experimental results of the barrier height study show the highest operating temperature of 186.5 K for the structure with 21% aluminum barriers, with a record kBTmax/hω value of 1.36 for a three-well active region design. An optimized heterostructure with 21% aluminum concentration and reduced cavity waveguide losses is designed and enables a record operating temperature of 196 K for a 3.8 THz QCL.

Klíčová slova

quantum cascade lasers; terahertz; molecular beam epitaxy; optical phonon; quantized transitions

Autoři

KAINZ, M.; SCHÖNHUBER, S.; ANDREWS, A.; DETZ, H.; STRASSER, G.; UNTERRAINER, K.

Vydáno

17. 10. 2018

ISSN

2330-4022

Periodikum

ACS Photonics

Ročník

5

Číslo

11

Stát

Spojené státy americké

Strany od

4687

Strany do

4693

Strany počet

7

URL

https://pubs.acs.org/doi/10.1021/acsphotonics.8b01280

BibTex

@article{BUT151466,
  author="Martin A. {Kainz} and Sebastian {Schönhuber} and Aaron Maxwell {Andrews} and Hermann {Detz} and Gottfried {Strasser} and Karl {Unterrainer}",
  title="Barrier Height Tuning of Terahertz Quantum Cascade Lasers for High-Temperature Operation",
  journal="ACS Photonics",
  year="2018",
  volume="5",
  number="11",
  pages="4687--4693",
  doi="10.1021/acsphotonics.8b01280",
  issn="2330-4022",
  url="https://pubs.acs.org/doi/10.1021/acsphotonics.8b01280"
}