TY - JOUR
T1 - Characterizing subpixel spatial resolution of a hybrid CMOS detector
AU - Bray, Evan
AU - Falcone, Abraham
AU - Wages, Mitchell
AU - Chattopadhyay, Tanmoy
AU - Burrows, David N.
N1 - Funding Information:
We would like to thank David Schendt and Matthew Kern for their work in preparing equipment and maintenance of the beam line, as well as other critical components of the test stand. Several aspects of the experiment would have taken significantly longer if not for their efforts. This work was supported by NASA grants NNX14AH68G and NNX16AO90H.
PY - 2018/7/1
Y1 - 2018/7/1
N2 - Soft X-rays (0.1 to 10 keV) will liberate between tens and thousands of electrons from the absorber array of a depleted silicon detector. These electrons tend to diffuse outward into what is referred to as the charge cloud, which is then picked up by several pixels and forms a specific pattern based on the exact incident location of the X-ray. By performing the first ever application of a "mesh experiment" on a hybrid CMOS detector (HCD), we have experimentally determined the charge cloud shape and used it to perform subpixel localization of incident X-rays on a photon-by-photon basis for a custom 36-μm pixel pitch H2RG HCD. We find that significant spatial resolution improvement is possible for all events, with 68% confidence regions equal to 7.1 × 7.1, 0.4 × 7.1, and 0.4 × 0.4 μm for 1-pixel, 2-pixel, and 3-to 4-pixel events, respectively. This represents a much finer resolution than that provided by containment within a single pixel.
AB - Soft X-rays (0.1 to 10 keV) will liberate between tens and thousands of electrons from the absorber array of a depleted silicon detector. These electrons tend to diffuse outward into what is referred to as the charge cloud, which is then picked up by several pixels and forms a specific pattern based on the exact incident location of the X-ray. By performing the first ever application of a "mesh experiment" on a hybrid CMOS detector (HCD), we have experimentally determined the charge cloud shape and used it to perform subpixel localization of incident X-rays on a photon-by-photon basis for a custom 36-μm pixel pitch H2RG HCD. We find that significant spatial resolution improvement is possible for all events, with 68% confidence regions equal to 7.1 × 7.1, 0.4 × 7.1, and 0.4 × 0.4 μm for 1-pixel, 2-pixel, and 3-to 4-pixel events, respectively. This represents a much finer resolution than that provided by containment within a single pixel.
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U2 - 10.1117/1.JATIS.4.3.038002
DO - 10.1117/1.JATIS.4.3.038002
M3 - Article
AN - SCOPUS:85051786464
SN - 2329-4124
VL - 4
JO - Journal of Astronomical Telescopes, Instruments, and Systems
JF - Journal of Astronomical Telescopes, Instruments, and Systems
IS - 3
M1 - 038002
ER -