25 September 2012 NIRSpec detectors: noise properties and the effect of signal dependent inter-pixel crosstalk
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NIRSpec (Near Infrared Spectrograph) is one of the four science instruments of the James Webb Space Telescope (JWST) and its focal plane consists of two HAWAII-2RG sensors operating in the wavelength range 0.6−5.0μm. As part of characterizing NIRSpec, we studied the noise properties of these detectors under dark and illuminated conditions. Under dark conditions, and as already known, 1/f noise in the detector system produces somewhat more noise than can be accounted for by a simple model that includes white read noise and shot noise on integrated charge. More surprisingly, at high flux, we observe significantly lower total noise levels than expected. We show this effect to be due to pixel-to-pixel correlations introduced by signal dependent inter-pixel crosstalk, with an inter-pixel coupling factor, α, that ranges from ~ 0.01 for zero signal to ~ 0.03 close to saturation.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Giovanna Giardino, Giovanna Giardino, Marco Sirianni, Marco Sirianni, Stephan M. Birkmann, Stephan M. Birkmann, Bernard J. Rauscher, Bernard J. Rauscher, Don Lindler, Don Lindler, Torsten Boeker, Torsten Boeker, Pierre Ferruit, Pierre Ferruit, Guido De Marchi, Guido De Marchi, Martin Stuhlinger, Martin Stuhlinger, Peter Jensen, Peter Jensen, Paolo Strada, Paolo Strada, } "NIRSpec detectors: noise properties and the effect of signal dependent inter-pixel crosstalk", Proc. SPIE 8453, High Energy, Optical, and Infrared Detectors for Astronomy V, 84531T (25 September 2012); doi: 10.1117/12.925357; https://doi.org/10.1117/12.925357

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