Comparison of THz-QCL Designs Supporting Clean N-Level Systems

Comparison of THz-QCL Designs Supporting Clean N-Level Systems

Three different Terahertz quantum-cascade-laser designs supporting clean n-level systems were analyzed using nonequilibrium Green’s functions. In clean n-level systems, most of the electrons occupy the active laser levels, with thermally activated leakage channels being suppressed almost entirely up...

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Main Authors: Nathalie Lander Gower, Silvia Piperno, Asaf Albo
Format: Article
Language:English
Published: MDPI AG 2021-06-01
Series:Photonics
Subjects:
THz-QCLs
LO-phonon scattering
resonant tunneling
Online Access:https://www.mdpi.com/2304-6732/8/7/248
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spelling doaj-9e70c7ff8a6b48c89954626a50baaa552021-07-23T14:01:03ZengMDPI AGPhotonics2304-67322021-06-01824824810.3390/photonics8070248Comparison of THz-QCL Designs Supporting Clean N-Level SystemsNathalie Lander Gower0Silvia Piperno1Asaf Albo2Faculty of Engineering, Bar-Ilan University, Ramat Gan 5290002, IsraelFaculty of Engineering, Bar-Ilan University, Ramat Gan 5290002, IsraelFaculty of Engineering, Bar-Ilan University, Ramat Gan 5290002, IsraelThree different Terahertz quantum-cascade-laser designs supporting clean n-level systems were analyzed using nonequilibrium Green’s functions. In clean n-level systems, most of the electrons occupy the active laser levels, with thermally activated leakage channels being suppressed almost entirely up to room temperature. Simulations of the three designs, namely a resonant phonon design, a two-well design, and a split-well direct-phonon design were investigated. The results from the simulations indicated that the two-well design would perform best overall, in terms of variations in current density, interface roughness, and ionized impurity scattering. We conclude that future research aiming to improve the temperature performance of such laser designs should be based on a two-well design.https://www.mdpi.com/2304-6732/8/7/248THz-QCLsLO-phonon scatteringresonant tunneling
collection DOAJ
language English
format Article
sources DOAJ
author Nathalie Lander Gower
Silvia Piperno
Asaf Albo
spellingShingle Nathalie Lander Gower
Silvia Piperno
Asaf Albo
Comparison of THz-QCL Designs Supporting Clean N-Level Systems
Photonics
THz-QCLs
LO-phonon scattering
resonant tunneling
author_facet Nathalie Lander Gower
Silvia Piperno
Asaf Albo
author_sort Nathalie Lander Gower
title Comparison of THz-QCL Designs Supporting Clean N-Level Systems
title_short Comparison of THz-QCL Designs Supporting Clean N-Level Systems
title_full Comparison of THz-QCL Designs Supporting Clean N-Level Systems
title_fullStr Comparison of THz-QCL Designs Supporting Clean N-Level Systems
title_full_unstemmed Comparison of THz-QCL Designs Supporting Clean N-Level Systems
title_sort comparison of thz-qcl designs supporting clean n-level systems
publisher MDPI AG
series Photonics
issn 2304-6732
publishDate 2021-06-01
description Three different Terahertz quantum-cascade-laser designs supporting clean n-level systems were analyzed using nonequilibrium Green’s functions. In clean n-level systems, most of the electrons occupy the active laser levels, with thermally activated leakage channels being suppressed almost entirely up to room temperature. Simulations of the three designs, namely a resonant phonon design, a two-well design, and a split-well direct-phonon design were investigated. The results from the simulations indicated that the two-well design would perform best overall, in terms of variations in current density, interface roughness, and ionized impurity scattering. We conclude that future research aiming to improve the temperature performance of such laser designs should be based on a two-well design.
topic THz-QCLs
LO-phonon scattering
resonant tunneling
url https://www.mdpi.com/2304-6732/8/7/248
work_keys_str_mv AT nathalielandergower comparisonofthzqcldesignssupportingcleannlevelsystems
AT silviapiperno comparisonofthzqcldesignssupportingcleannlevelsystems
AT asafalbo comparisonofthzqcldesignssupportingcleannlevelsystems
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