Shapiro, Charles and Huff, Eric and Smith, Roger (2018) Intra-pixel response characterization of a HgCdTe near infrared detector with a pronounced crosshatch pattern. In: High Energy, Optical, and Infrared Detectors for Astronomy VIII. Proceedings of SPIE. No.10709. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 1070936. ISBN 9781510619715. https://resolver.caltech.edu/CaltechAUTHORS:20190805-133842012
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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.
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| Additional Information: | © 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). Thanks to Warren Holmes and the Euclid detector working group for lending the H2RG detector used in this research. Thanks to Dave Hale and Alex Delacroix for helping to get the detector up and running. Thanks also to Mike Seiffert, Stefanie Wachter, and Chris Hirata for valuable insights and critiques of this research. This work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. Facility space and support for PPL is provided by Caltech Optical Observatories. | |||||||||
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| Subject Keywords: | near-infrared, detectors, astronomy, intra-pixel, calibration, photometry, Euclid | |||||||||
| Series Name: | Proceedings of SPIE | |||||||||
| Issue or Number: | 10709 | |||||||||
| Record Number: | CaltechAUTHORS:20190805-133842012 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190805-133842012 | |||||||||
| Official Citation: | Charles Shapiro, Eric Huff, and Roger Smith "Intra-pixel response characterization of a HgCdTe near infrared detector with a pronounced crosshatch pattern", Proc. SPIE 10709, High Energy, Optical, and Infrared Detectors for Astronomy VIII, 1070936 (12 July 2018); https://doi.org/10.1117/12.2314431 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 97641 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 05 Aug 2019 20:45 | |||||||||
| Last Modified: | 09 Mar 2020 13:18 |
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