Fig. 1. Schematic of long-/long-wavelength dual-band photodetector architecture and corresponding energy band structure

Fig. 2. （a）Growth sequence of 10.5 ML InAs/ 7 ML GaSb interface，（b）growth sequence of 14 ML InAs/ 7 ML GaSb interface

Fig. 3. Surface morphology of long-/long-wavelength dual-band superlattice materials（a）sample #1 and（b）sample #2

Fig. 4. AFM image of long-/long-wavelength dual-band superlattice materials（a）sample #1 and（b）sample #2

Fig. 5. XRD image of long-/long-wavelength dual-band superlattice

Fig. 6. （a）Microscopic image of 320×256（30μm）long-/long-wavelength dual-band superlattice photodetector，and（b）scanning electron micrograph of focal pixel array.

Fig. 7. Characterization of J-V and RA-V curves

Fig. 8. Spectral response of superlattice dual-band long-/long-wavelength infrared photodetector

Fig. 9. Infrared imagings of dual-band FPA (a) Band-1 channel imaging (b)Band-2 channel imaging