Type-II superlattice dual-band LWIR imager with M-barrier and Fabry-Perot resonance

Edward Kwei Wei Huang, Abbas Haddadi, Guanxi Chen, Binh Minh Nguyen, Minh Anh Hoang, Ryan McClintock, Mark Stegall, Manijeh Razeghi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


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 FabrÿCPerot 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.

Original languageEnglish (US)
Pages (from-to)2560-2562
Number of pages3
JournalOptics Letters
Issue number13
StatePublished - Jul 1 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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