Title :
Voltage-Tunable Two-Color Corrugated-QWIP Focal Plane Arrays
Author :
Choi, Kwong-Kit ; Jhabvala, Murzy D. ; Peralta, Richard J.
Author_Institution :
U.S. Army Res. Lab., Adelphi, MD
Abstract :
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.
Keywords :
focal planes; infrared detectors; photodetectors; quantum well devices; broadband corrugated light coupling; double-superlattice quantum well; photocurrent asymmetry; quantum efficiency; quantum well infrared photodetector; temperature 27 mK; temperature 50 K; temperature 90 mK; time 2 ms; time 33 ms; two-color focal plane arrays; voltage-tunable focal plane arrays; Coatings; Detectors; Noise measurement; Optical coupling; Optical noise; Photoconductivity; Quantum wells; Temperature measurement; Time measurement; Voltage; Infrared detectors; infrared image sensors; quantum wells;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2008.2001248
