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Proceedings Paper

Intra-pixel response characterization of a HgCdTe near infrared detector with a pronounced crosshatch pattern
Author(s): Charles Shapiro; Eric Huff; Roger Smith
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Paper Abstract

The “crosshatch” pattern is a recurring “feature” of HgCdTe arrays, specifically the Teledyne HAWAII family of near infrared detectors. It is a fixed pattern of high frequency QE variations along 3 directions generally thought to be related to the crystal structure of HgCdTe. The pattern is evident in detectors used in WFC3/IR, WISE, JWST, and in candidate detectors for Euclid and WFIRST. Using undersampled point sources projected onto a HAWAII-2RG detector, we show that the pattern induces photometric variations that are not removed by a flat-field calibration, thus demonstrating that the QE variations occur on scales smaller than the 18 micron pixels. Our testbed is the Precision Projector Laboratory’s astronomical scene generator, which can rapidly characterize the full detector by scanning thousands of undersampled spots. If not properly calibrated, detectors showing strong crosshatch may induce correlated errors in photometry, astrometry, spectroscopy, and shape measurements.

Paper Details

Date Published: 12 July 2018
PDF: 13 pages
Proc. SPIE 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII, 1070936 (12 July 2018); doi: 10.1117/12.2314431
Show Author Affiliations
Charles Shapiro, Jet Propulsion Lab. (United States)
Eric Huff, Jet Propulsion Lab. (United States)
Roger Smith, Caltech Optical Observatories (United States)

Published in SPIE Proceedings Vol. 10709:
High Energy, Optical, and Infrared Detectors for Astronomy VIII
Andrew D. Holland; James Beletic, Editor(s)

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