Short-period scattering-assisted terahertz quantum cascade lasers operating at high temperatures

Operating at high temperatures in the range of thermoelectric coolers is essential for terahertz quantum cascade lasers to real applications. The use of scattering-assisted injection scheme enables an increase in operating temperature. This concept, however, has not been implemented in a short-perio...

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Autores principales: Wang, Li, Lin, Tsung-Tse, Wang, Ke, Grange, Thomas, Birner, Stefan, Hirayama, Hideki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6602952/
https://www.ncbi.nlm.nih.gov/pubmed/31263207
http://dx.doi.org/10.1038/s41598-019-45957-8
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author Wang, Li
Lin, Tsung-Tse
Wang, Ke
Grange, Thomas
Birner, Stefan
Hirayama, Hideki
author_facet Wang, Li
Lin, Tsung-Tse
Wang, Ke
Grange, Thomas
Birner, Stefan
Hirayama, Hideki
author_sort Wang, Li
collection PubMed
description Operating at high temperatures in the range of thermoelectric coolers is essential for terahertz quantum cascade lasers to real applications. The use of scattering-assisted injection scheme enables an increase in operating temperature. This concept, however, has not been implemented in a short-period structure consisting of two quantum wells. In this work, based on non-equilibrium Green’s function calculations, it emphasizes on the current leakage and parasitic absorption via high-energy states as fundamental limitations in this scheme with short-period. A new design concept employing asymmetric wells composition is proposed to suppress these limitations. A peak gain of 40 cm(−1) at 230 K is predicted in the GaAs/AlGaAs semiconductor material system with an emission frequency of 3.5 THz.
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spelling pubmed-66029522019-07-14 Short-period scattering-assisted terahertz quantum cascade lasers operating at high temperatures Wang, Li Lin, Tsung-Tse Wang, Ke Grange, Thomas Birner, Stefan Hirayama, Hideki Sci Rep Article Operating at high temperatures in the range of thermoelectric coolers is essential for terahertz quantum cascade lasers to real applications. The use of scattering-assisted injection scheme enables an increase in operating temperature. This concept, however, has not been implemented in a short-period structure consisting of two quantum wells. In this work, based on non-equilibrium Green’s function calculations, it emphasizes on the current leakage and parasitic absorption via high-energy states as fundamental limitations in this scheme with short-period. A new design concept employing asymmetric wells composition is proposed to suppress these limitations. A peak gain of 40 cm(−1) at 230 K is predicted in the GaAs/AlGaAs semiconductor material system with an emission frequency of 3.5 THz. Nature Publishing Group UK 2019-07-01 /pmc/articles/PMC6602952/ /pubmed/31263207 http://dx.doi.org/10.1038/s41598-019-45957-8 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Wang, Li
Lin, Tsung-Tse
Wang, Ke
Grange, Thomas
Birner, Stefan
Hirayama, Hideki
Short-period scattering-assisted terahertz quantum cascade lasers operating at high temperatures
title Short-period scattering-assisted terahertz quantum cascade lasers operating at high temperatures
title_full Short-period scattering-assisted terahertz quantum cascade lasers operating at high temperatures
title_fullStr Short-period scattering-assisted terahertz quantum cascade lasers operating at high temperatures
title_full_unstemmed Short-period scattering-assisted terahertz quantum cascade lasers operating at high temperatures
title_short Short-period scattering-assisted terahertz quantum cascade lasers operating at high temperatures
title_sort short-period scattering-assisted terahertz quantum cascade lasers operating at high temperatures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6602952/
https://www.ncbi.nlm.nih.gov/pubmed/31263207
http://dx.doi.org/10.1038/s41598-019-45957-8
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