Narrow-Band Type II Superlattice Photodetector With Detection Wavelength Shorter Than <inline-formula> <tex-math notation="LaTeX">$2~\mu \text{m}$ </tex-math></inline-formula>

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We demonstrate that type II InAs/GaSb superlattice photodetector can reach the detection wavelength shorter than $2~\mu \text{m}$ by inserting AlSb barriers. The detector exhibits a narrow-band photoresponse feature ( $\delta \lambda /\lambda =10.3\%$ ). At 77 K, the photoresponse maximum is at 1.84 $\mu \text{m}$ and the Johnson noise limited detectivity is $1.1\times 10^{13}$ Jones. We show that unlike a typical broad-band response feature using the interband transitions, for a p-i-n detector in the short wavelength range, a narrow-band response feature is the case, which is ascribed to the stronger absorption for the higher energy photons from the n region.