The Response of Split-Well Direct-Phonon THz Quantum-Cascade Laser Structures to Changes in Doping

N. Lander Gower, S. Piperno, A. Albo

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

We have studied the effect of doping on the temperature performance of a split-well (SW) direct-phonon (DP) terahertz (THz) quantum-cascade laser (QCL) scheme supporting a clean three-level system. We expected to obtain a similar improvement in the temperature performance to that observed in resonant-phonon (RP) schemes after increasing the carrier concentration from 3 × 1010cm-2 to 6 × 1010, cm-2 To our surprise, in the devices we checked, the results show the contrary. However, we observed a significant increase in gain broadening and a reduction in the dephasing time as the doping and temperature increased. We attribute these effects to enhanced ionized-impurity scattering (IIS). The observation and study of effects related to dephasing included in our experimental work have previously only been possible via simulation.

Original languageEnglish
Title of host publicationIRMMW-THz 2022 - 47th International Conference on Infrared, Millimeter and Terahertz Waves
PublisherIEEE Computer Society
ISBN (Electronic)9781728194271
DOIs
StatePublished - 2022
Event47th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2022 - Delft, Netherlands
Duration: 28 Aug 20222 Sep 2022

Publication series

NameInternational Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
Volume2022-August
ISSN (Print)2162-2027
ISSN (Electronic)2162-2035

Conference

Conference47th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2022
Country/TerritoryNetherlands
CityDelft
Period28/08/222/09/22

Bibliographical note

Publisher Copyright:
© 2022 IEEE.

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