Abstract

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: R₁ (λ=6.85μ m) =67.5 mA/W, R₂ (λ=12.35μ m)=118.5 mA/W and ${\text{D}}_1^{\ast }\left(\lambda =6.85\right)=6.89\times {10}^7\text{J}$, ${\text{D}}_2^{\ast }\left(\lambda =12.35\right)=1.2\times {10}^8\text{J}$, respectively.

© 2009 OSA, IEEE Photonics Society, SPIE, COS, CIC