Dual Band MWIR/LWIR Focal Plane Array Test Results

摘要

We report the imaging test results of the first 2-color MWIRiLWIR 256 x 256 QWIP FPA with simultaneous integrating capability. The FPA studied contained stacked GaAs7AlGaAs QWIP structures with spectral peaks at 5.1 um and 9.0 um. Normally incident radiation was coupled into the device using a diffiaction grating designed to operate in both spectral bands. Each pixel is connected to the read-out integrated circuit by three bumps to permit the application of separate bias levels to each QWIP stack and allow simultaneous integration of the signal current in each band. We found the FPA to have high pixel opembility, well-balanced response, good imaging performance, high optical fill-factor, and low spectral crosstalk. Data are presented on measurements of the noise-equivalent temperature difference of the FPA in both bands as functions of bias and temperature. We also present data on the sensitivity of this FPA to polarized light.