Abstract

We report a high performance long-wavelength IR dual-band imager based on type-II superlattices with 100% cutoff wavelengths at $9.5\mathrm{\mu m}$ (blue channel) and $13\mathrm{\mu m}$ (red channel). Test pixels reveal background-limited behavior with specific detectivities as high as $\sim 5\times {10}^{11}$ Jones at $7.9\mathrm{\mu m}$ in the blue channel and $\sim 1\times {10}^{11}$ Jones at $10.2\mathrm{\mu m}$ in the red channel at $77\mathrm{K}$. These performances were attributed to low dark currents thanks to the M-barrier and Fabry–Perot enhanced quantum efficiencies despite using thin $2\mathrm{\mu m}$ absorbing regions. In the imager, the high signal-to-noise ratio contributed to median noise equivalent temperature differences of $\sim 20$ milli-Kelvin for both channels with integration times on the order of 0.5 ms, making it suitable for high speed applications.

© 2011 Optical Society of America

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