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Midinfrared quantum cascade detector with a spectrally broad response

Quantenkasdendetektor für das mittlere-Infrarot mit großer Bandbreite
: Hofstetter, D.; Giorgetta, F.R.; Baumann, E.; Yang, Q.K.; Manz, C.; Köhler, K.


Applied Physics Letters 93 (2008), Nr.22, Art. 221106, 3 S.
ISSN: 0003-6951
ISSN: 1077-3118
Fraunhofer IAF ()
Quantum cascade detector (QCD); Quantenkaskadendetektor; mid-infrared; mittleres Infrarot; broadband; große Bandbreite

A midinfrared quantum cascade detector with a spectrally broad (deltaE/E=27.3%) response is designed, fabricated, and tested. This detector consists of 26 differently designed active region stages in order to cover a wavelength region from 4.7 to 7.4 µm. The device could be operated above room temperature and showed peak responsivities of 13 mA/W at 10 K and 1.25 mA/W at room temperature. A background limited detectivity of 1.55x10(exp 10) Jones was seen up to a temperature T(ind BLIP) of 110 K.