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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/EF16_027%2F0008371" target="_blank" >EF16_027/0008371: Mezinárodní mobilita výzkumníků Vysokého učení technického v Brně</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>O - Projekt operacniho programu

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ACS Photonics

ISSN

2330-4022

e-ISSN

—

Svazek periodika

5

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

4687-4693

Kód UT WoS článku

000451496500063

EID výsledku v databázi Scopus

—