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Proceedings Paper

T2SL digital focal plane arrays for earth remote sensing applications
Author(s): Sarath Gunapala; Sir Rafol; David Ting; Alexander Soibel; Arezou Khoshakhlagh; Sam Keo; Brian Pepper; Anita Fisher; Edward Luong; Cory Hill; Kwong-Kit Choi; Arvind D'Souza; Christopher Masterjohn; Sachidananda Babu; Parminder Ghuman
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Paper Abstract

Long-wavelength infrared (LWIR) focal plane arrays (FPAs) needed for Earth Science imaging, spectral imaging, and sounding applications have always been among the most challenging in infrared photodetector technology due to the rigorous material growth, device design and fabrication demands. Future small satellite missions will present even more challenges for LWIR FPAs, as operating temperature must be increased so that cooler (and radiator) volume, mass, and power can be reduced. To address this critical need, we are working on following three technologies. 1) Type-II superlattice (T2SL) barrier infrared detector (BIRD), which combines the high operability, spatial uniformity, temporal stability, scalability, producibility, and affordability advantages of the quantum well infrared photodetector (QWIP) FPA with the better quantum efficiency and dark current characteristics. A mid-wavelength infrared (MWIR) T2SL BIRD FPA is a key demonstration technology in the (6U) CubeSat Infrared Atmospheric Sounder (CIRAS) funded under the ESTO InVEST Program. A LWIR T2SL BIRD FPA is also being developed under the ESTO SLI-T Program for future thermal infrared (TIR) land imaging needs. 2) The resonator pixel technology, which uses nanophotonics light trapping techniques to achieve strong absorption in a small detector absorber volume, thereby enabling enhanced QE and/or reduced dark current. 3) High dynamic range 3D Readout IC (3DROIC), which integrates a digital reset counter with a conventional analog ROIC to provide a much higher effective well capacity than previously achievable. The resulting longer integration times are especially beneficial for high flux/dark current LWIR applications as they can improve signal-to-noise ratio and/or increase the operating temperature. By combining the aforementioned technologies, this project seeks to demonstrate a cost-effective, high-performance LWIR FPA technology with significantly higher operating temperature and sensitivity than previously attainable, and with the flexibility to meet a variety of Earth Science TIR measurement needs, particularly the special requirements of small satellite missions.

Paper Details

Date Published: 13 May 2019
PDF: 8 pages
Proc. SPIE 10980, Image Sensing Technologies: Materials, Devices, Systems, and Applications VI, 109800J (13 May 2019); doi: 10.1117/12.2522145
Show Author Affiliations
Sarath Gunapala, Jet Propulsion Lab. (United States)
Sir Rafol, Jet Propulsion Lab. (United States)
David Ting, Jet Propulsion Lab. (United States)
Alexander Soibel, Jet Propulsion Lab. (United States)
Arezou Khoshakhlagh, Jet Propulsion Lab. (United States)
Sam Keo, Jet Propulsion Lab. (United States)
Brian Pepper, Jet Propulsion Lab. (United States)
Anita Fisher, Jet Propulsion Lab. (United States)
Edward Luong, Jet Propulsion Lab. (United States)
Cory Hill, Jet Propulsion Lab. (United States)
Kwong-Kit Choi, NASA Goddard Space Flight Ctr. (United States)
Arvind D'Souza, DRS Network & Imaging Systems, Inc. (United States)
Christopher Masterjohn, DRS Network & Imaging Systems, Inc. (United States)
Sachidananda Babu, NASA Earth Science Technology Office (United States)
Parminder Ghuman, NASA Earth Science Technology Office (United States)

Published in SPIE Proceedings Vol. 10980:
Image Sensing Technologies: Materials, Devices, Systems, and Applications VI
Nibir K. Dhar; Achyut K. Dutta; Sachidananda R. Babu, Editor(s)

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