Barrier Height Tuning of Terahertz Quantum Cascade Lasers for High-Temperature Operation
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F18%3APU129921" target="_blank" >RIV/00216305:26620/18:PU129921 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1021/acsphotonics.8b01280" target="_blank" >http://dx.doi.org/10.1021/acsphotonics.8b01280</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acsphotonics.8b01280" target="_blank" >10.1021/acsphotonics.8b01280</a>
Alternative languages
Result language
angličtina
Original language name
Barrier Height Tuning of Terahertz Quantum Cascade Lasers for High-Temperature Operation
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
<a href="/en/project/EF16_027%2F0008371" target="_blank" >EF16_027/0008371: International mobility of researchers at the Brno University of Technology</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>O - Projekt operacniho programu
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
ACS Photonics
ISSN
2330-4022
e-ISSN
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Volume of the periodical
5
Issue of the periodical within the volume
11
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
4687-4693
UT code for WoS article
000451496500063
EID of the result in the Scopus database
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