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Quantum Well and Quantum Dot Based Detector Arrays for Infrared Imaging

Published online by Cambridge University Press:  01 February 2011

Sarath Gunapala,
Sumith Bandara,
Cory Hill,
David Ting,
John Liu,
Jason Mumolo,
Sam Keo and
Edward Blazejewski
Sarath Gunapala
Affiliation:
sarath.d.gunapala@jpl.nasa.gov, California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA, 91109, United States, 818 354 1880, 818 393 4540
Sumith Bandara
Affiliation:
sumith.v.bandara@jpl.nasa.gov, California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA, 91109, United States
Cory Hill
Affiliation:
cory.hill@jpl.nasa.gov, California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA, 91109, United States
David Ting
Affiliation:
david.ting@jpl.nasa.gov, California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA, 91109, United States
John Liu
Affiliation:
john.liu@jpl.nasa.gov, California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA, 91109, United States
Jason Mumolo
Affiliation:
jason.mumolo@jpl.nasa.gov, California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA, 91109, United States
Sam Keo
Affiliation:
sam.keo@jpl.nasa.gov, California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA, 91109, United States
Edward Blazejewski
Affiliation:
edward.blazejewski@jpl.nasa.gov, California Institute of Technology, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA, 91109, United States
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Abstract

A mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) 320x256 pixel quantum well infrared photodetector (QWIP) dualband focal plane arrays (FPAs) have been demonstrated with excellent imagery. Currently, we are developing a 1024x1024 pixel simultaneous pixel co-registered dualband QWIP FPA. In addition, epitaxially grown self-assembled InAs/InGaAs/GaAs quantum dots (QDs) are exploited for the development of large-format FPAs. The Dot-in-a-Well (DWELL) structures were experimentally shown to absorb both 45° 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 microns, with peak detectivity reaching ∼ 1 × 1010 Jones at 77 K. The devices were fabricated into the first LWIR 640x512 pixel QDIP FPA, which has produced excellent infrared imagery with NETD of 40 mK at 60K operating temperature.

Keywords

infrared (IR) spectroscopydevicesphotoconductivity

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References

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