Dual-color mid-infrared Quantum Cascade Photodetector in coupled quantum well structure

In this paper, a novel structure for detection of two different wavelengths in mid-infrared region is proposed. By attaching a capturing well to the active region, a common transportation path for electron excited by two different wavelengths is introduced. Calculated values for responsivity and detectivity in the designed Quantum Cascade Photodetector structure at 120K are: R<inf>1</inf> (λ=6.85µm) =67.5mA W, R<inf>2</inf> (λ=12.35µm) =118.5mA/W and D<sup>*</sup><inf>1</inf> (λ=6.85) =6.89×10<sup>7</sup> J , D<sup>*</sup><inf>1</inf> (λ=12.35 =1.2×10<sup>8</sup> J , respectively.

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