We designed, fabricated, and measured anti-reflection coating (ARC) on sapphire that has 116% fractional bandwidth and transmission of at least 97% in the millimeter wave band. The ARC was based on patterning pyramid-like sub-wavelength structures (SWS) using ablation with a 15 W femto-second laser operating at 1030 nm. One side of each of two disks was fabricated with SWS that had a pitch of 0.54 mm and a height of 2 mm. The average ablation volume removal rate was 1.6 mm/min. Measurements of the two-disk sandwich show transmission higher than 97% between 43 and 161 GHz. We characterize instrumental polarization (IP) arising from differential transmission due to asymmetric SWS. We find that with proper alignment of the two-disk sandwich, RMS IP across the band is predicted to be 0.07% at normal incidence and less than 0.6% at incidence angles up to . These results indicate that laser ablation of SWS on sapphire and on other hard materials such as alumina is an effective way to fabricate broadband ARC.
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14 December 2020
Research Article|
December 09 2020
Broadband, millimeter-wave anti-reflective structures on sapphire ablated with femto-second laser
R. Takaku
;
R. Takaku
a)
1
Department of Physics, University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
a)Author to whom correspondence should be addressed: takaku@ac.jaxa.jp
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S. Hanany
;
S. Hanany
2
School of Physics and Astronomy, University of Minnesota/Twin Cities
, Minneapolis, Minnesota 55455, USA
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H. Imada;
H. Imada
3
Kavli Institute for the Physics and Mathematics of the Universe
, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba 277-8583, Japan
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H. Ishino;
H. Ishino
4
Okayama University
, 3-1-1 Tsushimanaka, Kita-ku, Okayama, Okayama 700-8530, Japan
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N. Katayama;
N. Katayama
3
Kavli Institute for the Physics and Mathematics of the Universe
, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba 277-8583, Japan
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K. Komatsu;
K. Komatsu
4
Okayama University
, 3-1-1 Tsushimanaka, Kita-ku, Okayama, Okayama 700-8530, Japan
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K. Konishi
;
K. Konishi
5
Institute for Photon Science and Technology, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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M. Kuwata-Gonokami
;
M. Kuwata-Gonokami
1
Department of Physics, University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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T. Matsumura
;
T. Matsumura
3
Kavli Institute for the Physics and Mathematics of the Universe
, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba 277-8583, Japan
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K. Mitsuda;
K. Mitsuda
6
Institute of Space and Astronautical Science, Japanese Aerospace Exploration Agency
, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan
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H. Sakurai
;
H. Sakurai
5
Institute for Photon Science and Technology, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Y. Sakurai
;
Y. Sakurai
3
Kavli Institute for the Physics and Mathematics of the Universe
, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba 277-8583, Japan
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Q. Wen;
Q. Wen
2
School of Physics and Astronomy, University of Minnesota/Twin Cities
, Minneapolis, Minnesota 55455, USA
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N. Y. Yamasaki
;
N. Y. Yamasaki
6
Institute of Space and Astronautical Science, Japanese Aerospace Exploration Agency
, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan
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K. Young
;
K. Young
2
School of Physics and Astronomy, University of Minnesota/Twin Cities
, Minneapolis, Minnesota 55455, USA
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J. Yumoto
J. Yumoto
1
Department of Physics, University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
5
Institute for Photon Science and Technology, The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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a)Author to whom correspondence should be addressed: takaku@ac.jaxa.jp
J. Appl. Phys. 128, 225302 (2020)
Article history
Received:
July 23 2020
Accepted:
November 17 2020
Citation
R. Takaku, S. Hanany, H. Imada, H. Ishino, N. Katayama, K. Komatsu, K. Konishi, M. Kuwata-Gonokami, T. Matsumura, K. Mitsuda, H. Sakurai, Y. Sakurai, Q. Wen, N. Y. Yamasaki, K. Young, J. Yumoto; Broadband, millimeter-wave anti-reflective structures on sapphire ablated with femto-second laser. J. Appl. Phys. 14 December 2020; 128 (22): 225302. https://doi.org/10.1063/5.0022765
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