Abstract

We report a high performance long-wavelength IR dual-band imager based on type-II superlattices with 100% cutoff wavelengths at 9.5μm (blue channel) and 13μm (red channel). Test pixels reveal background-limited behavior with specific detectivities as high as 5×1011 Jones at 7.9μm in the blue channel and 1×1011 Jones at 10.2μm in the red channel at 77K. These performances were attributed to low dark currents thanks to the M-barrier and Fabry–Perot enhanced quantum efficiencies despite using thin 2μm 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.

© 2011 Optical Society of America

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