We report a type-II superlattice mid-wave infrared $320\times 256$ imager at 81 K with the M-barrier design that achieved background limited performance (BLIP) and $\sim 99\%$ operability. The 280 K blackbody’s photon irradiance was limited by an aperture and a band-pass filter from 3.6 μm to 3.8 μm resulting in a total flux of $\sim 5\times {10}^{12}\mathrm{ph}.{\mathrm{cm}}^{-2}.{\mathrm{s}}^{-1}$. Under these low-light conditions, and consequently the use of a 13.5 ms integration time, the imager was observed to be BLIP thanks to a $\sim 5\mathrm{pA}$ dark current from the 27 μm wide pixels. The total noise was dominated by the photon flux and read-out circuit which gave the imager a noise equivalent input of $\sim 5\times {10}^{10}\mathrm{ph}.{\mathrm{cm}}^{-2}.{\mathrm{s}}^{-1}$ and temperature sensitivity of 9 mK with $F/2.3$ optics. Excellent imagery obtained using a 1-point correction alludes to the array’s uniform responsivity.

© 2012 Optical Society of America

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