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Voltage-Tunable Two-Color Corrugated-QWIP Focal Plane Arrays

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3 Author(s)
Kwong-Kit Choi ; U.S. Army Res. Lab., Adelphi, MD ; Jhabvala, M.D. ; Peralta, R.J.

We demonstrated a 256 times 256 voltage-tunable two- color corrugated quantum-well infrared-photodetector focal plane array. The detector operation is based on photocurrent asymmetry in a double-superlattice quantum well structure. By using a broadband corrugated light coupling scheme, we obtained a quantum efficiency of 24% in the mid-wave (MW) band and 26% in the long-wave (LW) band without AR coating. Operating at 50 K, the measured noise equivalent temperature difference is 27 mK at 33-ms integration time for the MW and 90 mK at 2 ms for the LW with f/2.44 optics. The NETD operability values are 98.4% and 95.9%, respectively.

Published in:

Electron Device Letters, IEEE  (Volume:29 ,  Issue: 9 )