All

What are you looking for?

All
Projects
Results
Organizations

Quick search

  • Projects supported by TA ČR
  • Excellent projects
  • Projects with the highest public support
  • Current projects

Smart search

  • That is how I find a specific +word
  • That is how I leave the -word out of the results
  • “That is how I can find the whole phrase”

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

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • 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

  • 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