Design and fabrication of metamaterial anti-reflection coatings for the Simons Observatory

Joseph E. Golec; Jeffrey J. McMahon; Aamir M. Ali; Grace E. Chesmore; Leah Cooperrider; Simon Dicker; Nicholas Galitzki; Kathleen Harrington; Rebecca Jackson; Benjamin Westbrook; Edward J. Wollack; Zhilei Xu; Ningfeng Zhu

doi:10.1117/12.2561720

16 December 2020 Design and fabrication of metamaterial anti-reflection coatings for the Simons Observatory

Joseph E. Golec, Jeffrey J. McMahon, Aamir M. Ali, Grace E. Chesmore, Leah Cooperrider, Simon Dicker, Nicholas Galitzki, Kathleen Harrington, Rebecca Jackson, Benjamin Westbrook, Edward J. Wollack, Zhilei Xu, Ningfeng Zhu

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Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 114515T (2020) https://doi.org/10.1117/12.2561720
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The Simons Observatory (SO) will be a cosmic microwave background (CMB) survey experiment with three small-aperture telescopes and one large-aperture telescope, which will observe from the Atacama Desert in Chile. In total, SO will field over 60,000 transition-edge sensor (TES) bolometers in six spectral bands centered between 27 and 280 GHz in order to achieve the sensitivity necessary to measure or constrain numerous cosmological quantities, as outlined in The Simons Observatory Collaboration et al. (2019). These telescopes require 33 highly transparent, large aperture, refracting optics. To this end, we developed mechanically robust, highly efficient, metamaterial anti-reflection (AR) coatings with octave bandwidth coverage for silicon optics up to 46 cm in diameter for the 22-55, 75-165, and 190-310 GHz bands. We detail the design, the manufacturing approach to fabricate the SO lenses, their performance, and possible extensions of metamaterial AR coatings to optical elements made of harder materials such as alumina.

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Joseph E. Golec, Jeffrey J. McMahon, Aamir M. Ali, Grace E. Chesmore, Leah Cooperrider, Simon Dicker, Nicholas Galitzki, Kathleen Harrington, Rebecca Jackson, Benjamin Westbrook, Edward J. Wollack, Zhilei Xu, and Ningfeng Zhu "Design and fabrication of metamaterial anti-reflection coatings for the Simons Observatory", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 114515T (16 December 2020); https://doi.org/10.1117/12.2561720

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