Quantum efficiency performances of the NIR European Large Format Array detectors tested at ESTEC

Crouzet, Pierre-Elie; Duvet, L.; Wit, F. de; Beaufort, T.; Blommaert, Sander; Bütler, B.; Duinkerken, G. Van; Haar, J. ter; Heijnen, Jerko; Luijt, K. van der; Smit, Hans

doi:10.1117/12.2208268

Cited by 9 publications

(4 citation statements)

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“…This means a more complex procedure is needed to probe the BFE in infrared arrays. Furthermore, determination of the gain from variance versus mean plots must be corrected for IPC to obtain meaningful results (e.g., Moore et al 2006;Fox et al 2008;Crouzet et al 2012). Normally the IPC is described by replacing the linear term in Equation (7) with a kernel describing the capacitive cross-talk among the pixels:…”

Section: Gains Nonlinearities and Ipcmentioning

confidence: 99%

Brighter-fatter Effect in Near-infrared Detectors. I. Theory of Flat Autocorrelations

Hirata

Choi

2019

PASP

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Weak gravitational lensing studies aim to measure small distortions in the shapes of distant galaxies, and thus place very tight demands on the understanding of detectorinduced systematic effects in astronomical images. The Wide-Field Infrared Survey Telescope (WFIRST) will carry out weak lensing measurements in the near infrared using the new Teledyne H4RG-10 detector arrays, which makes the range of possible detector systematics very different from traditional weak lensing measurements using optical CCDs. One of the non-linear detector effects observed in CCDs is the brighterfatter effect (BFE), in which charge already accumulated in a pixel alters the electric field geometry and causes new charge to be deflected away from brighter pixels. Here we describe the formalism for measuring the BFE using flat field correlation functions in infrared detector arrays. The auto-correlation of CCD flat fields is often used to measure the BFE, but because the infrared detector arrays are read out with the charge "in place," the flat field correlations are dominated by capacitive cross-talk between neighboring pixels (the inter-pixel capacitance, or IPC). We show that because the infrared detector arrays can be read out non-destructively, one can compute numerous cross-correlation functions between different time slices of the same flat exposures, and that correlations due to IPC and BFE leave distinct imprints. We generate a suite of simulated flat fields and show that the underlying IPC and BFE parameters can be extracted, even when both are present in the simulation. There are some biases in the BFE coefficients up to 12%, which are likely caused by higher order terms that are dropped from this analysis. The method is applied to laboratory data in the companion Paper II.

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Section: Gains Nonlinearities and Ipcmentioning

confidence: 99%

Brighter-fatter Effect in Near-infrared Detectors. I. Theory of Flat Autocorrelations

Hirata

Choi

2019

PASP

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“…Failure to account for IPC results in underestimation of conversion gain (Moore et al 2006;Fox et al 2008;Crouzet et al 2012) and overestimation of various kinds of quantum efficiencies (DQE;McCullough et al 2007). Thus, IPC must be estimated and accounted for in order to understand the fundamental parameters of the detectors.…”

Section: Implications Of Ipcmentioning

confidence: 99%

The Impact of Interpixel Capacitance in CMOS Detectors on PSF Shapes and Implications for WFIRST

Kannawadi

Shapiro

Mandelbaum

et al. 2016

PASP

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Unlike optical CCDs, near-infrared detectors, which are based on CMOS hybrid readout technology, typically suffer from electrical crosstalk between the pixels. The interpixel capacitance (IPC) responsible for the crosstalk affects the point-spread function (PSF) of the telescope, increasing the size and modifying the shape of all objects in the images while correlating the Poisson noise. Upcoming weak lensing surveys that use these detectors, such as WFIRST, place stringent requirements on the PSF size and shape (and the level at which these are known), which in turn must be translated into requirements on IPC. To facilitate this process, we present a first study of the effect of IPC on WFIRST PSF sizes and shapes. Realistic PSFs are forward-simulated -2 -from physical principles for each WFIRST bandpass. We explore how the PSF size and shape depends on the range of IPC coupling with pixels that are connected along an edge or corner; for the expected level of IPC in WFIRST, IPC increases the PSF sizes by ∼5%. We present a linear fitting formula that describes the uncertainty in the PSF size or shape due to uncertainty in the IPC, which could arise for example due to unknown time evolution of IPC as the detectors age or due to spatial variation of IPC across the detector. We also study of the effect of a small anisotropy in the IPC, which further modifies the PSF shapes. Our results are a first, critical step in determining the hardware and characterization requirements for the detectors used in the WFIRST survey.

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“…Strong effort has been carried out during the last few years at LETI and Sofradir for such applications. p/n NIR diodes now exhibit features compatible with low flux astronomy needs, both for LPE and MBE grown material [ 19 ] and effort should now focus on larger format arrays. However, n/p APDs could also be a viable solution, with a potential gain in ultimate performances thanks to noiseless gain.…”

Section: Discussionmentioning

confidence: 99%

HgCdTe detectors for space and science imaging in France: general issues and latest achievements

Gravrand

Rothman

Cervera

et al. 2017

International Conference on Space Optics — ICSO 2016

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Quantum efficiency performances of the NIR European Large Format Array detectors tested at ESTEC

Cited by 9 publications

References 0 publications

Brighter-fatter Effect in Near-infrared Detectors. I. Theory of Flat Autocorrelations

Brighter-fatter Effect in Near-infrared Detectors. I. Theory of Flat Autocorrelations

The Impact of Interpixel Capacitance in CMOS Detectors on PSF Shapes and Implications for WFIRST

HgCdTe detectors for space and science imaging in France: general issues and latest achievements

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