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Innovative mid-infrared detector concepts

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Hoefling_Innovative_ProcSPIE_997306.pdf (2.245Mb)
Date
14/09/2016
Author
Höfling, Sven
Pfenning, Andreas
Weih, Robert
Ratajczak, Albert
Hartmann, Fabian
Knebl, Georg
Kamp, Martin
Worschech, Lukas
Keywords
Gas sensing
Interband cascade detector
Mid-IR
Resonant tunneling diode
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering
NDAS
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Abstract
Gas sensing is a key technology with applications in various industrial, medical and environmental areas. Optical detection mechanisms allow for a highly selective, contactless and fast detection. For this purpose, rotational-vibrational absorption bands within the mid infrared (MIR) spectral region are exploited and probed with appropriate light sources. During the past years, the development of novel laser concepts such as interband cascade lasers (ICLs) and quantum cascade lasers (QCLs) has driven a continuous optimization of MIR laser sources. On the other hand side, there has been relatively little progress on detectors in this wavelength range. Here, we study two novel and promising GaSb-based detector concepts: Interband cascade detectors (ICD) and resonant tunneling diode (RTD) photodetectors. ICDs are a promising approach towards highly sensitive room temperature detection of MIR radiation. They make use of the cascading scheme that is enabled by the broken gap alignment of the two binaries GaSb and InAs. The interband transition in GaSb/InAs-superlattices (SL) allows for normal incidence detection. The cut-off wavelength, which determines the low energy detection limit, can be engineered via the SL period. RTD photodetectors act as low noise and high speed amplifiers of small optically generated electrical signals. In contrast to avalanche photodiodes, where the gain originates from multiplication due to impact ionization, in RTD photodetectors a large tunneling current is modulated via Coulomb interaction by the presence of photogenerated minority charge carriers. For both detector concepts, first devices operational at room temperature have been realized.
Citation
Höfling , S , Pfenning , A , Weih , R , Ratajczak , A , Hartmann , F , Knebl , G , Kamp , M & Worschech , L 2016 , Innovative mid-infrared detector concepts . in M Strojnik (ed.) , Infrared Remote Sensing and Instrumentation XXIV . , 997306 , Proceedings of SPIE , vol. 9973 , SPIE , Infrared Remote Sensing and Instrumentation XXIV , San Diego , United States , 29/08/16 . https://doi.org/10.1117/12.2237270
 
conference
 
Publication
Infrared Remote Sensing and Instrumentation XXIV
DOI
https://doi.org/10.1117/12.2237270
ISSN
0277-786X
Type
Conference item
Rights
© 2016, SPIE. This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at proceedings.spiedigitallibrary.org / https://doi.org/10.1117/12.2237270
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/10169

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