Title :
640 × 512 Pixels Long-Wavelength Infrared (LWIR) Quantum-Dot Infrared Photodetector (QDIP) Imaging Focal Plane Array
Author :
Gunapala, Sarath D. ; Bandara, Sumith V. ; Hill, Cory J. ; Ting, David Z. ; Liu, John K. ; Rafol, Sir B. ; Blazejewski, Edward R. ; Mumolo, Jason M. ; Keo, Sam A. ; Krishna, Sanjay ; Chang, Y.C. ; Shott, Craig A.
Author_Institution :
California Inst. of Technol., Pasadena, CA
fDate :
3/1/2007 12:00:00 AM
Abstract :
Epitaxially grown self-assembled InAs-InGaAs-GaAs quantum dots (QDs) are exploited for the development of large-format long-wavelength infrared focal plane arrays (FPAs). The dot-in-a-well (DWELL) structures were experimentally shown to absorb both 45deg and normal incident light, therefore, a reflection grating structure was used to enhance the quantum efficiency. The devices exhibit peak responsivity out to 8.1 mum, with peak detectivity reaching ~1times1010 Jones at 77 K. The devices were fabricated into the first long-wavelength 640times512 pixel QD infrared photodetector imaging FPA, which has produced excellent infrared imagery with noise equivalent temperature difference of 40 mK at 60-K operating temperature
Keywords :
diffraction gratings; focal planes; infrared detectors; optical fabrication; photodetectors; semiconductor quantum dots; 60 K; InAs-InGaAs-GaAs quantum dots; dot-in-a-well structures; imaging focal plane array; noise equivalent temperature; quantum-dot infrared photodetector; reflection grating structure; Electromagnetic wave absorption; Infrared detectors; Infrared imaging; Optical imaging; Optical scattering; Photodetectors; Photonic band gap; Pixel; Quantum dots; Temperature; Focal plane array; infrared detector; quantum dots (QDs);
Journal_Title :
Quantum Electronics, IEEE Journal of
DOI :
10.1109/JQE.2006.889645