Extended cut-off wavelength nBn detector utilizing InAsSb/lnSb digital alloy absorber

摘要

We investigated a novel approach to extend a cut-off wavelength of Sb-based nBn detectors. We incorporated a series of single InSb monolayer into InAsSb bulk that allowed to realize a digital alloy absorber with an extended cut-off wavelength of λ = 4.6 μm at T = 200 K. The cut-off wavelength extension to 4.6um is technologically important for realization of detectors covering CO2 absorption line at 4.26μm.