Abstract
SCD has developed a range of advanced infrared detectors based on III-V semiconductor heterostructures, grown on GaSb. The XBn/XBp family of detectors enables diffusion limited behavior with dark currents comparable with MCT Rule-07 and with high quantum efficiencies. InAsSb/AlSbAs based XBn focal plane array detectors with a cut-off wavelength of ∼ 4.1 μm and formats presently up to 1024×1280 / 15 μm, operate with background limited performance up to ∼175 K at F/3. They have a sensitivity and image quality comparable with those of standard InSb detectors working at 77K. In an XBp configuration, the same concept has been applied to an InAs/GaSb type II superlattice (T2SL) detector with a cut-off wavelength of ∼ 9.5 μm, which operates with background limited performance up to ∼100 K at F/2. In order to design our detectors effectively, a suite of simulation algorithms was developed based on the k<. p and optical transfer matrix methods. In a given T2SL detector, the complete spectral response curve can be predicted essentially from a knowledge of the InAs and GaSb layer widths in a single period of the superlattice. Gallium free T2SL detectors in which the GaSb layer is replaced with InAs1-xSbx (x ∼ 0.15-0.5) have also been simulated and the predicted spectral response compared for the two detector types.
Original language | English |
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Title of host publication | Quantum Sensing and Nanophotonic Devices XII |
Editors | Manijeh Razeghi, Eric Tournie, Gail J. Brown |
Publisher | SPIE |
ISBN (Electronic) | 9781628414608 |
DOIs | |
State | Published - 2015 |
Externally published | Yes |
Event | Quantum Sensing and Nanophotonic Devices XII - San Francisco, United States Duration: 8 Feb 2015 → 12 Feb 2015 |
Publication series
Name | Proceedings of SPIE - The International Society for Optical Engineering |
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Volume | 9370 |
ISSN (Print) | 0277-786X |
ISSN (Electronic) | 1996-756X |
Conference
Conference | Quantum Sensing and Nanophotonic Devices XII |
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Country/Territory | United States |
City | San Francisco |
Period | 8/02/15 → 12/02/15 |
Bibliographical note
Publisher Copyright:© 2015 SPIE.
Keywords
- Infrared detector
- Type II superlattice
- XBn
- XBp
- focal plane array
- gallium free superlattice