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  Probing scattering mechanisms with symmetric quantum cascade lasers

Deutsch, C., Detz, H., Zederbauer, T., Andrews, A. M., Klang, P., Kubis, T., et al. (2013). Probing scattering mechanisms with symmetric quantum cascade lasers. Optics Express, 21(6), 7209-7213. doi:10.1364/OE.21.007209.

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 Creators:
Deutsch, Christoph1, Author
Detz, Hermann2, Author
Zederbauer, Tobias2, Author
Andrews, Aaron M.2, Author
Klang, Pavel2, Author
Kubis, Tillmann3, Author
Klimeck, Gerhard3, Author
Schuster, Manfred Erwin4, Author              
Schrenk, Werner2, Author
Strasser, Gottfried2, Author
Unterrainer, Karl1, Author
Affiliations:
1Photonics Institute and Center for Micro- and Nanostructures, Vienna University of Technology, Gusshausstrasse 27–29, 1040 Vienna, Austria, ou_persistent22              
2Institute of Solid-State Electronics and Center for Micro- and Nanostructures, Vienna University of Technology, Floragasse 7, 1040 Vienna, Austria , ou_persistent22              
3Network for Computational Nanotechnology, Purdue University, 207 S Martin Jischke Drive, West Lafayette, Indiana 47907, USA , ou_persistent22              
4Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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 Abstract: A characteristic feature of quantum cascade lasers is their unipolar carrier transport. We exploit this feature and realize nominally symmetric active regions for terahertz quantum cascade lasers, which should yield equal performance with either bias polarity. However, symmetric devices exhibit a strongly bias polarity dependent performance due to growth direction asymmetries, making them an ideal tool to study the related scattering mechanisms. In the case of an InGaAs/GaAsSb heterostructure, the pronounced interface asymmetry leads to a significantly better performance with negative bias polarity and can even lead to unidirectionally working devices, although the nominal band structure is symmetric. The results are a direct experimental proof that interface roughness scattering has a major impact on transport/lasing performance.

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Language(s): eng - English
 Dates: 2013-02-142012-12-112013-02-142013-02
 Publication Status: Published online
 Pages: 7
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1364/OE.21.007209
 Degree: -

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Title: Optics Express
Source Genre: Journal
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Publ. Info: Washington, DC : Optical Society of America
Pages: - Volume / Issue: 21 (6) Sequence Number: - Start / End Page: 7209 - 7213 Identifier: ISSN: 1094-4087
CoNE: https://pure.mpg.de/cone/journals/resource/954925609918