Quantum cascade detectors for very long wave infrared detection

Buffaz, A.; Carras, M.; Doyennette, L.; Nedelcu, A.; Marcadet, X.; Berger, V.
April 2010
Applied Physics Letters;4/26/2010, Vol. 96 Issue 17, p172101
Academic Journal
A high responsivity GaAs/AlGaAs quantum cascade detector is demonstrated at a wavelength of 15 μm. The quantum design is optimized for negative bias operation, so that the capture of photoexcited electrons back to the fundamental level is minimized. The detectivity of the detector presented here reaches 1.1×1012 Jones at 25 K for an applied bias of -0.6 V.


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