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

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

Physics and Astronomy (Twin Cities)

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

7 Scopus citations

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.

Original language	English (US)
Title of host publication	Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X
Editors	Jonas Zmuidzinas, Jian-Rong Gao
Publisher	SPIE
ISBN (Electronic)	9781510636934
DOIs	https://doi.org/10.1117/12.2562028
State	Published - 2020
Event	Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X 2020 - Virtual, Online, United States Duration: Dec 14 2020 → Dec 22 2020

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11453
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X 2020
Country/Territory	United States
City	Virtual, Online
Period	12/14/20 → 12/22/20

Bibliographical note

Publisher Copyright:
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Keywords

CMB
broadband anti-reection
laser ablation
millimeter-wavelength

Publisher link

10.1117/12.2562028

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Takaku, R., Hanany, S., Hoshino, Y., Imada, H., Ishino, H., Katayama, N., Komatsu, K., Konishi, K., Kuwata Gonokami, M., Matsumura, T., Mitsuda, K., Sakurai, H., Sakurai, Y., Wen, Q., Yamasaki, N. Y., Young, K., & Yumoto, J. (2020). Demonstration of anti-reflective structures over a large area for CMB polarization experiments. In J. Zmuidzinas, & J.-R. Gao (Eds.), Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X Article 114531A (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11453). SPIE. https://doi.org/10.1117/12.2562028

Demonstration of anti-reflective structures over a large area for CMB polarization experiments. / Takaku, Ryota; Hanany, Shaul; Hoshino, Yurika et al.
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X. ed. / Jonas Zmuidzinas; Jian-Rong Gao. SPIE, 2020. 114531A (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11453).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Takaku, R, Hanany, S, Hoshino, Y, Imada, H, Ishino, H, Katayama, N, Komatsu, K, Konishi, K, Kuwata Gonokami, M, Matsumura, T, Mitsuda, K, Sakurai, H, Sakurai, Y, Wen, Q, Yamasaki, NY, Young, K & Yumoto, J 2020, Demonstration of anti-reflective structures over a large area for CMB polarization experiments. in J Zmuidzinas & J-R Gao (eds), Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X., 114531A, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11453, SPIE, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X 2020, Virtual, Online, United States, 12/14/20. https://doi.org/10.1117/12.2562028

Takaku R, Hanany S, Hoshino Y, Imada H, Ishino H, Katayama N et al. Demonstration of anti-reflective structures over a large area for CMB polarization experiments. In Zmuidzinas J, Gao JR, editors, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X. SPIE. 2020. 114531A. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2562028

Takaku, Ryota ; Hanany, Shaul ; Hoshino, Yurika et al. / Demonstration of anti-reflective structures over a large area for CMB polarization experiments. Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X. editor / Jonas Zmuidzinas ; Jian-Rong Gao. SPIE, 2020. (Proceedings of SPIE - The International Society for Optical Engineering).

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title = "Demonstration of anti-reflective structures over a large area for CMB polarization experiments",

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.",

keywords = "CMB, broadband anti-reection, laser ablation, millimeter-wavelength",

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

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year = "2020",

doi = "10.1117/12.2562028",

language = "English (US)",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

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TY - GEN

T1 - Demonstration of anti-reflective structures over a large area for CMB polarization experiments

AU - Takaku, Ryota

AU - Hanany, Shaul

AU - Hoshino, Yurika

AU - Imada, Hiroaki

AU - Ishino, Hirokazu

AU - Katayama, Nobuhiko

AU - Komatsu, Kunimoto

AU - Konishi, Kuniaki

AU - Kuwata Gonokami, Makoto

AU - Matsumura, Tomotake

AU - Mitsuda, Kazuhisa

AU - Sakurai, Haruyuki

AU - Sakurai, Yuki

AU - Wen, Qi

AU - Yamasaki, Noriko Y.

AU - Young, Karl

AU - Yumoto, Junji

PY - 2020

Y1 - 2020

N2 - 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.

AB - 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.

KW - CMB

KW - broadband anti-reection

KW - laser ablation

KW - millimeter-wavelength

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ER -

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

Abstract

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