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Proceedings Paper

Multiband infrared detectors based on III-V materials
Author(s): Sumith V. Bandara; Sarath D. Gunapala; Cory J. Hill; John K. Liu; Sir B. Rafol; Jason M. Mumolo; David Z. Ting; Thang Trinh
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Paper Abstract

Infrared detector technology based on intersubband absorption in III-V materials has shown remarkable success in advancing low-cost, highly uniform, high-operability, large-format focal plane arrays (FPAs). It also permits vertical integration of detector stacks to create multi-band or tunable FPAs. Each detector stack of multi-quantum well layers absorbs photons within the specified wavelength band, allowing other photons to transmit through permitting multiband detection. The wavelength of the peak response and cutoff can be continuously tailored by varying layer thickness (well width), barrier composition (barrier height), and carrier density (well-doping density). The GaAs/AlxGa1-xAs material system allows the quantum well parameters to be varied over a range wide enough to enable light detection at any wavelength range from 6 to 20 μm. By adding a few monolayers of InyGa1-yAs during the GaAs quantum well growth, the short wavelength limit can be extended to 3 μm. The spectral bandwidth of these detectors can be tuned from narrow (Δλ/λ ~ 10%) to wide (Δλ/λ ~ 40%), according to application requirements. Multi-band detector technology can be extended to near IR or visible wavelengths by adding detector layers utilizing interband absorption in these materials.

Paper Details

Date Published: 4 November 2004
PDF: 8 pages
Proc. SPIE 5543, Infrared Spaceborne Remote Sensing XII, (4 November 2004); doi: 10.1117/12.561352
Show Author Affiliations
Sumith V. Bandara, Jet Propulsion Lab. (United States)
Sarath D. Gunapala, Jet Propulsion Lab. (United States)
Cory J. Hill, Jet Propulsion Lab. (United States)
John K. Liu, Jet Propulsion Lab. (United States)
Sir B. Rafol, Jet Propulsion Lab. (United States)
Jason M. Mumolo, Jet Propulsion Lab. (United States)
David Z. Ting, Jet Propulsion Lab. (United States)
Thang Trinh, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 5543:
Infrared Spaceborne Remote Sensing XII
Marija Strojnik, Editor(s)

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