Large format AlInAs-InGaAs quantum-well infrared photodetector focal plane array for midwavelength infrared thermal imaging

Ozer S., Tumkaya U., Besikci C.

IEEE PHOTONICS TECHNOLOGY LETTERS, vol.19, pp.1371-1373, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 19
  • Publication Date: 2007
  • Doi Number: 10.1109/lpt.2007.903338
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1371-1373
  • Middle East Technical University Affiliated: Yes


We report the first large format (640 x 512) AlInAs-InGaAs quantum-well infrared photodetector (QWIP) focal plane array (FPA), and investigate the characteristics of AlInAs-InGaAs QWIPs both at pixel and FPA level. The measurements on the detectors fabricated with molecular beam epitaxy grown epilayer structure including 30 InGaAs quantum wells (26 A thick, N-D = 2 x 10(18) cm(-3)) yielded very promising characteristics. The detectors with lambda(p) = 4.2 mu m and Delta lambda/lambda(p) = 25% displayed a background-limited performance temperature as high as 105 K with f/2 aperture. The noise equivalent temperature difference of the FPA is as low as 23 mK (f/1.5) at 105-K sensor temperature with 99.6% operability. These results are comparable to the best results reported for AlGaAs-InGaAs midwavelength infrared QWIPs showing the promise of this material system for completely lattice-matched multiband QWIP FPAs.