Long-wavelength 256/spl times/256 GaAs/AlGaAs quantum well infrared photodetector (QWIP) palm-size camera

A 9 /spl mu/m cutoff 256/spl times/256 palm-size quantum well infrared photodetector (QWIP) camera weighing only 2.5 lbs, and using 5.5 W of power has been demonstrated. Excellent imagery, with a noise equivalent differential temperature (NE/spl Delta/T) of 23 mK has been achieved. It is well known that QWIP has very low 1/f noise, high operability, and uniformity. As a result, this camera uses a prerecorded nonuniformity correction table (i.e., gains and offsets) stored in its read-only-memory during operation, which enabled the miniaturization of this camera. In this paper, we discuss the development of this very sensitive long-wavelength infrared (LWIR) camera based on a GaAs/AlGaAs QWIP focal plane array (FPA) and its performance in terms of quantum efficiency, NE/spl Delta/T, MRDT, uniformity, and operability.

[1]  Kwong-Kit Choi,et al.  Corrugated QWIP array fabrication and characterization , 1998, Photonics West.

[2]  J. Y. Andersson,et al.  Quantum Well Intersubband Transition Physics and Devices , 1994 .

[3]  Lester J. Kozlowski,et al.  LWIR 128*128 GaAs/AlGaAs multiple quantum well hybrid focal plane array , 1991 .

[4]  H. Choi,et al.  Room‐temperature cw operation at 2.2 μm of GaInAsSb/AlGaAsSb diode lasers grown by molecular beam epitaxy , 1991 .

[5]  Y. H. Wang,et al.  Novel Grating Coupled and Normal Incidence III-V Quantum well Infrared Photodetectors with Background Limited Performance at 77 K , 1994 .

[6]  C. A. Shott,et al.  9-/spl mu/m cutoff 256/spl times/256 GaAs/Al/sub x/Ga/sub 1-x/As quantum well infrared photodetector hand-held camera , 1997 .

[7]  G. Iafrate,et al.  High detectivity InGaAs base infrared hot‐electron transistor , 1991 .

[8]  K. M. S. V. Bandara,et al.  Improved performance of quantum well infrared photodetectors using random scattering optical coupling , 1994 .

[9]  D. Gerstenberg,et al.  Physics of Thin Films , 1964 .

[10]  K. M. S. V. Bandara,et al.  Recent Developments in Quantum-Well Infrared Photodetectors , 1995 .

[11]  Rainer Breiter,et al.  Recent developments for QWIP IR imaging modules at AIM , 1998, Defense, Security, and Sensing.

[12]  James J. Bock,et al.  Quantum well infrared photodetector research and development at Jet Propulsion Laboratory , 1998, Defense, Security, and Sensing.

[13]  W. J. Parrish,et al.  Long wavelength infrared 128*128 Al/sub x/Ga/sub 1-x/As/GaAs quantum well infrared camera and imaging system , 1993 .

[14]  J. Y. Andersson,et al.  Quantum efficiency enhancement of AlGaAs/GaAs quantum well infrared detectors using a waveguide with a grating coupler , 1991 .

[15]  Jan Y. Andersson,et al.  320 x 240 pixels quantum well infrared photodetector (QWIP) array for thermal imaging: fabrication and evaluation , 1997, Defense, Security, and Sensing.

[16]  C. A. Shott,et al.  Long-wavelength 640/spl times/486 GaAs-AlGaAs quantum well infrared photodetector snap-shot camera , 1998 .