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dc.contributor.authorHöfling, Sven
dc.contributor.authorPfenning, Andreas
dc.contributor.authorWeih, Robert
dc.contributor.authorRatajczak, Albert
dc.contributor.authorHartmann, Fabian
dc.contributor.authorKnebl, Georg
dc.contributor.authorKamp, Martin
dc.contributor.authorWorschech, Lukas
dc.contributor.editorStrojnik, Marija
dc.identifier.citationHöfling , 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 .
dc.identifier.otherPURE: 248904616
dc.identifier.otherPURE UUID: a90402c8-0afc-4a19-9a3a-46fe4f8bbe5c
dc.identifier.otherScopus: 85008512349
dc.identifier.otherWOS: 000390265000005
dc.description.abstractGas 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.
dc.relation.ispartofInfrared Remote Sensing and Instrumentation XXIVen
dc.relation.ispartofseriesProceedings of SPIEen
dc.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 /
dc.subjectGas sensingen
dc.subjectInterband cascade detectoren
dc.subjectResonant tunneling diodeen
dc.subjectQC Physicsen
dc.subjectTK Electrical engineering. Electronics Nuclear engineeringen
dc.subjectElectronic, Optical and Magnetic Materialsen
dc.subjectCondensed Matter Physicsen
dc.subjectComputer Science Applicationsen
dc.subjectApplied Mathematicsen
dc.subjectElectrical and Electronic Engineeringen
dc.titleInnovative mid-infrared detector conceptsen
dc.typeConference itemen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen

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