Demonstration of anti-reflective structures over a large area for CMB polarization experiments

Ryota Takaku; Shaul Hanany; Yurika Hoshino; Hiroaki Imada; Hirokazu Ishino; Nobuhiko Katayama; Kunimoto Komatsu; Kuniaki Konishi; Makoto Kuwata Gonokami; Tomotake Matsumura; Kazuhisa Mitsuda; Haruyuki Sakurai; Yuki Sakurai; Qi Wen; Noriko Y. Yamasaki; Karl Young; Junji Yumoto

doi:10.1117/12.2562028

16 December 2020 Demonstration of anti-reflective structures over a large area for CMB polarization experiments

Ryota Takaku, Shaul Hanany, Yurika Hoshino, Hiroaki Imada, Hirokazu Ishino, Nobuhiko Katayama, Kunimoto Komatsu, Kuniaki Konishi, Makoto Kuwata Gonokami, Tomotake Matsumura, Kazuhisa Mitsuda, Haruyuki Sakurai, Yuki Sakurai, Qi Wen, Noriko Y. Yamasaki, Karl Young, Junji Yumoto

Author Affiliations +

Proceedings Volume 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X; 114531A (2020) https://doi.org/10.1117/12.2562028
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

Sapphire, alumina, and silicon present the following characteristics that make them suitable as optical elements for millimeter and sub-millimeter applications: low-loss, high thermal conductivity at cryogenic temperatures, and high refractive index ~3. However, the high index also leads to high reflection. We developed a technique to machine sub-wavelength structures (SWS) as a broadband anti-reflection coating on these materials through laser ablation. We describe here the status of our development: transmission measurements of fabricated samples in a diameter of 34.5 mm agree with predictions, and we are now focusing on increasing the fabrication area with high processing rate. This is motivated by the need of ~500 mm diameter optical elements for the next-generation cosmic microwave background polarization experiments. We show our large area machining method on the alumina and sapphire over an area of < 5200 mm²with the processing rate of < 4:0 mm³=min:, and the transmission measurements are consistent with the predictions.

Conference Presentation

Citation Download Citation

Ryota Takaku, Shaul Hanany, Yurika Hoshino, Hiroaki Imada, Hirokazu Ishino, Nobuhiko Katayama, Kunimoto Komatsu, Kuniaki Konishi, Makoto Kuwata Gonokami, Tomotake Matsumura, Kazuhisa Mitsuda, Haruyuki Sakurai, Yuki Sakurai, Qi Wen, Noriko Y. Yamasaki, Karl Young, and Junji Yumoto "Demonstration of anti-reflective structures over a large area for CMB polarization experiments", Proc. SPIE 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, 114531A (16 December 2020); https://doi.org/10.1117/12.2562028

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