Quantum cascade detectors in very long wave infrared

Very long wave (> 14μm) infrared quantum cascade detectors based on III-V materials are presented. Thanks to the optimum design of electron transport mechanism, high detectivity is obtained without decreasing device responsivity. For the 14.2 μm QCD, a work temperature up to 82K is obtained with a peak responsivity about 0.95 mA/W and detectivity of 1×10
⁸
Jones. Peak responsivities is 2.34 mA/W and Johnson noise limited detectivities is 1×0
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Jones, at 15K for the 18 μm devices.