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7 April 2005 Infrared focal plane array based on MWIR/LWIR dual-band QWIPs: detector optimization and array properties
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Abstract
Quantum well infrared photodetectors (QWIPs) have gained maturity for large focal plane arrays (FPA) with excellent thermal resolution, low 1/f noise, low fixed-pattern noise, and high pixel operability. Due to their spectrally narrow absorption, QWIPs are particularly suitable for thermal imaging applications involving several atmospheric transmission bands or several colors within the same band. We report on our progress on dual-band QWIP FPAs with pixel-registered, simultaneous integration in both bands. The arrays with 384x288 pixels and 40 μm pitch are based on a photoconductive QWIP for the 3-5 μm regime (MWIR) and a photovoltaic "low-noise" QWIP for 8-12 μm (LWIR). Excellent noise-equivalent temperature differences of only 20.6 mK (LWIR) and 26.7 mK (MWIR) have been achieved at 6.8 ms integration time and f/2 aperture. In addition, we have investigated test devices with different gratings, and discuss their dual-band coupling efficiencies.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Harald Schneider, Thomas Maier, Joachim Fleissner, Martin Walther, Peter Koidl, Gunter Weimann, Wolfgang Cabanski, Marcus Finck, Peter Menger, Werner Rode, and Johann Ziegler "Infrared focal plane array based on MWIR/LWIR dual-band QWIPs: detector optimization and array properties", Proc. SPIE 5726, Semiconductor Photodetectors II, (7 April 2005); https://doi.org/10.1117/12.591546
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