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Quantum cascade detectors for very long wave infrared detection
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View: Figures


Image of FIG. 1.
FIG. 1.

Conduction band structure of a QCD for the very long wave infrared range under an applied bias of −1.1 V (−8.36 kV/cm). The whole cascade , the fundamental level of the previous cascade and the excited level of the following one together with their associated stationary envelope functions are presented.

Image of FIG. 2.
FIG. 2.

Spectral responsivity of the QCD at 25 K for an applied bias equal to −1.1 V. Inset: Peak responsivity (at ) as a function of the bias.

Image of FIG. 3.
FIG. 3.

Specific detectivity as a function of the temperature for two different applied biases in dark conditions. The solid red line was obtained for a bias equal to −0.6 V and the dotted blue line under no applied bias. The two points at corresponds to the specific detectivity measured under illumination with a blackbody at 295 K with an aperture of f/1.6: green dash: at ; orange rhombus: at . Inset: Current density as a function of the bias at 25 K in dark conditions (solid black line) and under illumination by a blackbody at 295 K with an aperture of f/1.6 (dashed red line).

Image of FIG. 4.
FIG. 4.

Experimental (solid black line) and calculated (dashed red line) current density characteristics for negative bias at 25 K. The calculated curve is the result of the model detailed in Ref. 13.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Quantum cascade detectors for very long wave infrared detection