TY - JOUR
T1 - Blooming in H2RG arrays
T2 - Laboratory measurements of a second brighter-fatter type effect in HgCdTe infrared detectors
AU - Zengilowski, Gregory R.
AU - Cabrera, Mario S.
AU - McMurtry, Craig W.
AU - Pipher, Judith L.
AU - Dorn, Meghan L.
AU - Reilly, Nicholas S.
AU - Bovie, Danielle
AU - Mainzer, Amy K.
AU - Wong, Andre F.
AU - Lee, Donald
N1 - Funding Information:
Funding for this work was received from Cornell University through New York Space Grant No. 80NSSC20M0096, the Jet Propulsion Laboratory through the Near Earth Object Camera (NEOCam) Extended Phase A Subcontract 1573311, and the University of Arizona through the Near Earth Object Surveillance Mission (NEOSM) Extended Phase A Grant No. 80MSFC20C0045. The authors would also like to thank Peter Eisenhardt of the Jet Propulsion Laboratory for his contributions to this work. In addition, the authors would like to thank the referees for their constructive feedback and support in strengthening this paper.
Publisher Copyright:
© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE).
PY - 2021/4/1
Y1 - 2021/4/1
N2 - Improved measurement and calibration of detector behaviors will be crucial for future space missions, particularly those aiming to tackle outstanding questions in cosmology and exoplanet research. Similarly, many small detector effects, such as the nearest-neighbor interactions of the brighter-fatter effect and interpixel capacitance, will need to be considered to ensure measured signals are truly astronomical in origin. Laboratory measurements confirming the existence of an additional brighter-fatter type effect in HAWAII-1RG and HAWAII-2RG HgCdTe infrared arrays with cutoff wavelengths ranging from 5.7 to 16.7 μm are presented. This effect is similar in nature to the blooming observed in charge-coupled devices and is characterized by a pixel spontaneously sharing a current with its neighbors upon reaching saturation, serving to make the brightest sources appear fatter. In addition to exploring the cause and mechanism of current sharing for this effect, measurements for several arrays show the magnitude of the shared current is greater than 60% of the incoming photocurrent hitting the saturated pixel. A proof-of-concept correction method for this effect is also described along with the necessary next steps to improve this correction and investigate the amplitude of other nearest-neighbor interactions.
AB - Improved measurement and calibration of detector behaviors will be crucial for future space missions, particularly those aiming to tackle outstanding questions in cosmology and exoplanet research. Similarly, many small detector effects, such as the nearest-neighbor interactions of the brighter-fatter effect and interpixel capacitance, will need to be considered to ensure measured signals are truly astronomical in origin. Laboratory measurements confirming the existence of an additional brighter-fatter type effect in HAWAII-1RG and HAWAII-2RG HgCdTe infrared arrays with cutoff wavelengths ranging from 5.7 to 16.7 μm are presented. This effect is similar in nature to the blooming observed in charge-coupled devices and is characterized by a pixel spontaneously sharing a current with its neighbors upon reaching saturation, serving to make the brightest sources appear fatter. In addition to exploring the cause and mechanism of current sharing for this effect, measurements for several arrays show the magnitude of the shared current is greater than 60% of the incoming photocurrent hitting the saturated pixel. A proof-of-concept correction method for this effect is also described along with the necessary next steps to improve this correction and investigate the amplitude of other nearest-neighbor interactions.
KW - HgCdTe
KW - brighter-fatter effect
KW - infrared detector
KW - long wavelength infrared
KW - midwave infrared
KW - nearest-neighbor interactions
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U2 - 10.1117/1.JATIS.7.2.026002
DO - 10.1117/1.JATIS.7.2.026002
M3 - Article
AN - SCOPUS:85110745785
SN - 2329-4124
VL - 7
JO - Journal of Astronomical Telescopes, Instruments, and Systems
JF - Journal of Astronomical Telescopes, Instruments, and Systems
IS - 2
M1 - 026002
ER -