title: Type-II superlattice dual-band LWIR imager with M-barrier and Fabry-Perot resonance.
abstract: We report a high performance long-wavelength IR dual-band imager based on type-II superlattices with 100% cutoff wavelengths at 9.5 μm (blue channel) and 13 μm (red channel). Test pixels reveal background-limited behavior with specific detectivities as high as ~5×10¹¹ Jones at 7.9 μm in the blue channel and ~1×10¹¹ Jones at 10.2 μm in the red channel at 77 K. These performances were attributed to low dark currents thanks to the M-barrier and Fabry-Perot enhanced quantum efficiencies despite using thin 2 μm absorbing regions. In the imager, the high signal-to-noise ratio contributed to median noise equivalent temperature differences of ~20 milli-Kelvin for both channels with integration times on the order of 0.5 ms, making it suitable for high speed applications.
authors: Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208, USA.
authors: Edward Kwei-wei
authors: EK
authors: Huang
authors: Abbas
authors: A
authors: Haddadi
authors: Guanxi
authors: G
authors: Chen
authors: Binh-Minh
authors: BM
authors: Nguyen
authors: Minh-Anh
authors: MA
authors: Hoang
authors: Ryan
authors: R
authors: McClintock
authors: Mark
authors: M
authors: Stegall
authors: Manijeh
authors: M
authors: Razeghi