Zero dark current in H2RG detectors: it is all multiplexer glow

Michael W. Regan; Louis E. Bergeron

doi:10.1117/12.2562365

13 December 2020 Zero dark current in H2RG detectors: it is all multiplexer glow

Michael W. Regan, Louis E. Bergeron

Proceedings Volume 11454, X-Ray, Optical, and Infrared Detectors for Astronomy IX; 114541M (2020) https://doi.org/10.1117/12.2562365
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

We present analysis of James Webb Space Telescope (JWST) near infrared H2RG detectors ul{with a 5$upmu$m cutoff} showing that at temperatures below 60K there is no measurable dark current. Instead, the observed signal in dark exposures is almost entirely due to multiplexer glow that arises as each pixel is selected. We are able to separate the per sample glow from the time dependent dark current by comparing the observed signal in both continuous and sparsely sampled dark exposures. We show that the glow is lower within the regions of the detector that are missing the epoxy back fill (voids). We also show that the magnitude of the glow is affected by the pixel source follower current, the pixel clocking rate, and the number of outputs running in parallel. Our measurement of an insignificant dark current shows that the detector noise is no longer limited by the quality of the HgCdTe layer but instead by the multiplexer and readout electronics.

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Citation Download Citation

Michael W. Regan and Louis E. Bergeron "Zero dark current in H2RG detectors: it is all multiplexer glow", Proc. SPIE 11454, X-Ray, Optical, and Infrared Detectors for Astronomy IX, 114541M (13 December 2020); https://doi.org/10.1117/12.2562365

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KEYWORDS

Sensors

Multiplexers

James Webb Space Telescope

Amplifiers

Electronics

Epoxies

Infrared sensors

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