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4.3 μm quantum cascade detector in pixel configuration

 
: Harrer, A.; Schwarz, B.; Schuler, S.; Reininger, P.; Wirthmüller, A.; Detz, H.; MacFarland, D.; Zederbauer, T.; Andrews, A.M.; Rothermund, M.; Oppermann, H.; Schrenk, W.; Strasser, G.

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Optics Express 24 (2016), No.15, pp.17041-17049
ISSN: 1094-4087
English
Journal Article, Electronic Publication
Fraunhofer IZM ()

Abstract
We present the design simulation and characterization of a quantum cascade detector operating at 4.3μm wavelength. Array integration and packaging processes were investigated. The device operates in the 4.3μm CO2 absorption region and consists of 64 pixels. The detector is designed fully compatible to standard processing and material growth methods for scalability to large pixel counts. The detector design is optimized for a high device resistance at elevated temperatures. A QCD simulation model was enhanced for resistance and responsivity optimization. The substrate illuminated pixels utilize a two dimensional Au diffraction grating to couple the light to the active region. A single pixel responsivity of 16mA/W at room temperature with a specific detectivity D* of 5⋅107 cm√Hz/W was measured.

: http://publica.fraunhofer.de/documents/N-421832.html