Design of multilayer band-pass filters for processing RAPAS alerts

Noémie Gambaudo; Xavier Queyroux De Bizemont; Patrice Twardowski; Thierry Midavaine; Philippe Gérard; Romain Jagu; Manuel Flury

doi:10.1117/12.3017013

10 June 2024 Design of multilayer band-pass filters for processing RAPAS alerts

Noémie Gambaudo, Xavier Queyroux De Bizemont, Patrice Twardowski, Thierry Midavaine, Philippe Gérard, Romain Jagu, Manuel Flury

Author Affiliations +

Proceedings Volume 12990, Metamaterials XIV; 129900L (2024) https://doi.org/10.1117/12.3017013
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

Gaia mission is providing the most accurate astrometric and photometric star catalogue (June 2022 DR3), in addition it is providing, as various projects on earth or in space, numerous alerts concerning different celestial objects and transient events. To make comparison between the observations on earth, it is recommended that they be well standardized, using optical filters adapted to Gaia three spectral bands. In this work, we propose to reproduce these three spectral bands using multilayer filter containing non periodic structures using optimization algorithms, such as Levenberg-Marquardt algorithm, “needle” algorithm and genetic algorithm. Optimizing multilayers for optical applications is still a major issue today, with the aim of achieving the best possible specifications with the fewest possible layers. Three multi-layer filters are proposed made up respectively of 20, 40 and 60 layers deposited on BK7 substrate, to match the specifications provided by the RAPAS network. We also investigated the use of other substrates and thin metal layers, which helped us to reduce the number of layers in the optimization process.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Noémie Gambaudo, Xavier Queyroux De Bizemont, Patrice Twardowski, Thierry Midavaine, Philippe Gérard, Romain Jagu, and Manuel Flury "Design of multilayer band-pass filters for processing RAPAS alerts", Proc. SPIE 12990, Metamaterials XIV, 129900L (10 June 2024); https://doi.org/10.1117/12.3017013

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