NIRSpec detectors: noise properties and the effect of signal dependent inter-pixel crosstalk

Giovanna Giardino; Marco Sirianni; Stephan M. Birkmann; Bernard J. Rauscher; Don Lindler; Torsten Boeker; Pierre Ferruit; Guido De Marchi; Martin Stuhlinger; Peter Jensen; Paolo Strada

doi:10.1117/12.925357

25 September 2012 NIRSpec detectors: noise properties and the effect of signal dependent inter-pixel crosstalk

Giovanna Giardino, Marco Sirianni, Stephan M. Birkmann, Bernard J. Rauscher, Don Lindler, Torsten Boeker, Pierre Ferruit, Guido De Marchi, Martin Stuhlinger, Peter Jensen, Paolo Strada

Author Affiliations +

Proceedings Volume 8453, High Energy, Optical, and Infrared Detectors for Astronomy V; 84531T (2012) https://doi.org/10.1117/12.925357
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

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.

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Giovanna Giardino, Marco Sirianni, Stephan M. Birkmann, Bernard J. Rauscher, Don Lindler, Torsten Boeker, Pierre Ferruit, Guido De Marchi, Martin Stuhlinger, Peter Jensen, and 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); https://doi.org/10.1117/12.925357

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