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Diving deep into the milky way using anti-reflection coatings for astronomical CCDs

Aggarwal, Anmol; Mittal, Ashi; Seabroke, George M; Puri, Nitin K; (2023) Diving deep into the milky way using anti-reflection coatings for astronomical CCDs. Journal of Astrophysics and Astronomy , 44 (2) , Article 74. 10.1007/s12036-023-09962-8. Green open access

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Abstract

We report two anti-reflection (AR) coatings that give better quantum efficiency (QE) than the existing AR coating on the Gaia astrometric field (AF) charged coupled devices (CCDs). Light being the core of optical astronomy is extremely important for such missions, therefore, the QE of the devices that are used to capture it should be substantially high. To reduce the losses due to the reflection of light from the surface of the CCDs, AR coatings can be applied. Currently, the main component of the Gaia satellite, the AF CCDs use hafnium dioxide (HfO2) AR coating. In this paper, the ATLAS module of the SILVACO software has been employed for simulating and studying the AF CCD pixel structure and several AR coatings. Our findings suggest that zirconium dioxide (ZrO2) and tantalum pentoxide (Ta2O5) will prove to be better AR coatings for broadband astronomical CCDs in the future and will open new avenues to understand the evolution of the milky way.

Type: Article
Title: Diving deep into the milky way using anti-reflection coatings for astronomical CCDs
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s12036-023-09962-8
Publisher version: https://doi.org/10.1007/s12036-023-09962-8
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Gaia; SILVACO TCAD; astronomical instrumentation; charged coupled devices; anti-reflection coatings
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10179036
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