Updated on 2026/01/08

写真a

 
Ryota Takaku
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Special-Appointment Assistant Professor
Position
Special-Appointment Assistant Professor
External link

Degree

  • Philosophy ( 2023.3   The University of Tokyo )

Research Interests

  • cosmic microwave background

  • Ultrashort pulse laser ablation

  • 超伝導検出器

Education

  • The University of Tokyo   大学院理学系研究科大学院博士課程  

    2018.4 - 2023.3

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    Country： Japan

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  • Yokohama National University   理工学部   数物・電子情報系学科

    2013.4 - 2018.3

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    Country： Japan

    Notes： 物理工学EP

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Research History

  • High Energy Accelerator Research Organization   Institute of Particle and Nuclear Studies

    2025.5

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    Country：Japan

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  • Okayama University   The Graduate School of Environmental and Life Science   Designated Assistant Professor

    2025.5

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  • High Energy Accelerator Research Organization   International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles   PD

    2024.4 - 2025.4

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    Country：Japan

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  • The University of Tokyo   Kavli Institute for the Physics and Mathematics of the Universe   PD

    2023.4 - 2024.3

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    Country：Japan

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Papers

  • Performance of a 200 mm Diameter Achromatic HWP with Laser-Ablated Sub-Wavelength Structures Reviewed

    R. Takaku, T. Ghigna, S. Hanany, Y. Hoshino, H. Ishino, N. Katayama, K. Komatsu, K. Konishi, M. Kuwata-Gonokami, T. Matsumura, H. Sakurai, Y. Sakurai, Q. Wen, N. Y. Yamasaki, J. Yumoto

    Journal of Low Temperature Physics   2023.6

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s10909-022-02922-6

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  • A Large Diameter Millimeter-Wave Low-Pass Filter Made of Alumina with Laser Ablated Anti-Reflection Coating Reviewed

    Ryota Takaku, Qi Wen, Scott Cray, Mark Devlin, Simon Dicker, Shaul Hanany, Takashi Hasebe, Teruhito Iida, Nobuhiko Katayama, Kuniaki Konishi, Makoto Kuwata-Gonokami, Tomtoake Matsumura, Norikatsu Mio, Haruyuki Sakurai, Yuki Sakurai, Ryohei Yamada, Junji Yumoto

    Optics Express   2021.11

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Optical Society  

    DOI： 10.1364/oe.444848

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  • Broadband, millimeter-wave anti-reflective structures on sapphire ablated with femto-second laser Reviewed

    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

    Journal of Applied Physics   2020.12

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/5.0022765

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  • Laser-ablated sub-wavelength structure anti-reflection coating on an alumina lens Reviewed

    Shaul Hanany, Scott Cray, Samuel Dietterich, Jan Düsing, Calvin Firth, Jürgen Koch, Rex Lam, Tomotake Matsumura, Haruyuki Sakurai, Yuki Sakurai, Aritoki Suzuki, Ryota Takaku, Qi Wen, Alexander Wienke, Andrew Y. Yan

    Journal of Astronomical Telescopes, Instruments, and Systems   11 ( 04 )   2025.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPIE-Intl Soc Optical Eng  

    DOI： 10.1117/1.jatis.11.4.045004

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  • Requirements on bandpass resolution and measurement precision for LiteBIRD Reviewed

    S. Giardiello, A. Carones, T. Ghigna, L. Pagano, F. Piacentini, L. Montier, R. Takaku, E. Calabrese, D. Adak, E. Allys, A. Anand, J. Aumont, M. Ballardini, A.J. Banday, R.B. Barreiro, N. Bartolo, S. Basak, M. Bersanelli, A. Besnard, M. Bortolami, T. Brinckmann, F.J. Casas, K. Cheung, M. Citran, L. Clermont, F. Columbro, A. Coppolecchia, F. Cuttaia, P. de Bernardis, E. de la Hoz, M. De Lucia, S. Della Torre, E. Di Giorgi, P. Diego-Palazuelos, U. Fuskeland, G. Galloni, M. Galloway, M. Gerbino, M. Gervasi, R.T. Génova-Santos, C. Gimeno-Amo, A. Gruppuso, M. Hazumi, S. Henrot-Versillé, L.T. Hergt, B. Jost, K. Kohri, L. Lamagna, C. Leloup, F. Levrier, A.I. Lonappan, M. López-Caniego, G. Luzzi, J. Macias-Perez, V. Maranchery, E. Martínez-González, S. Masi, S. Matarrese, T. Matsumura, S. Micheli, M. Migliaccio, M. Monelli, G. Morgante, L. Mousset, R. Nagata, A. Novelli, F. Noviello, I. Obata, A. Occhiuzzi, A. Paiella, D. Paoletti, G. Pascual-Cisneros, G. Patanchon, M. Pinchera, G. Polenta, L. Porcelli, G. Puglisi, N. Raffuzzi, M. Remazeilles, A. Rizzieri, M. Ruiz-Granda, J. Sanghavi, V. Sauvage, G. Savini, M. Shiraishi, G. Signorelli, R.M. Sullivan, Y. Takase, L. Terenzi, M. Tomasi, M. Tristram, L. Vacher, B. van Tent, P. Vielva, I.K. Wehus, G. Weymann-Despres, E.J. Wollack, Y. Zhou

    Journal of Cosmology and Astroparticle Physics   2025 ( 10 )   038 - 038   2025.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

    Abstract

    Systematic effects can hinder the sought-after detection of primordial gravitational waves, impacting the reconstruction of the B -mode polarization signal which they generate in the cosmic microwave background (CMB). In this work, we study the impact of an imperfect knowledge of the instrument bandpasses on the estimate of the tensor-to-scalar ratio r in the context of the next-generation LiteBIRD satellite. We develop a pipeline to integrate over the bandpass transmission in both the time-ordered data (TOD) and the map-making processing steps. We introduce the systematic effect by having a mismatch between the “real”, high resolution bandpass τ , entering the TOD, and the estimated one τ s , used in the map-making. We focus on two aspects: the effect of degrading the τ s resolution, and the addition of a Gaussian error σ to τ s . To reduce the computational load of the analysis, the two effects are explored separately, for three representative LiteBIRD channels (40 GHz, 140 GHz and 402 GHz) and for three bandpass shapes. Computing the amount of bias on r , Δ r , caused by these effects on a single channel, we find that a resolution ≲ 1.5 GHz and σ ≲ 0.0089 do not exceed the LiteBIRD budget allocation per systematic effect, Δ r < 6.5 × 10 -6 . We then check that propagating separately the uncertainties due to a resolution of 1 GHz and a measurement error with σ = 0.0089 in all LiteBIRD frequency channels, for the most pessimistic bandpass shape of the three considered, still produces a Δ r < 6.5 × 10 -6 . This is done both with the simple deprojection approach and with a blind component separation technique, the Needlet Internal Linear Combination (NILC). Due to the effectiveness of NILC in cleaning the systematic residuals, we have tested that the requirement on σ can be relaxed to σ ≲ 0.05.

    DOI： 10.1088/1475-7516/2025/10/038

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    Other Link： https://iopscience.iop.org/article/10.1088/1475-7516/2025/10/038/pdf

  • Development status of the polarization modulator using 330 mm diameter sapphire-based achromatic half-wave plate for LiteBIRD

    Ryota Takaku, Kosuke Aizawa, Ryosuke Akizawa, Gilberto Goracci, Thuong D. Hoang, Teruhito Iida, Kiyoshi Ikuma, Kuniaki Konishi, Mitsuharu Kusama, Clément Leloup, Asuka Maeda, Tomotake Matsumura, Hiroyuki Ohsaki, Satsuki Okumura, Haruyuki Sakurai, Yuki Sakurai, Yutaka Terao, Ryota Uematsu

    Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII   96 - 96   2024.12

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.3015964

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  • Impact of half-wave plate systematics on the measurement of CMB B-mode polarization Reviewed

    Marta Monelli, Eiichiro Komatsu, Tommaso Ghigna, Tomotake Matsumura, Giampaolo Pisano, Ryota Takaku

    Journal of Cosmology and Astroparticle Physics   2024.5

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1088/1475-7516/2024/05/018

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  • Modeling TES Nonlinearity Induced by a Rotating HWP in a CMB Polarimeter Reviewed

    T. Ghigna, T. Matsumura, Y. Sakurai, R. Takaku, K. Komatsu, S. Sugiyama, Y. Hoshino, N. Katayama

    Journal of Low Temperature Physics   211 ( 5-6 )   357 - 365   2023.1

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s10909-023-02939-5

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    Other Link： https://link.springer.com/article/10.1007/s10909-023-02939-5/fulltext.html

  • Sensitivity Modeling for LiteBIRD Reviewed

    T. Hasebe, P. A. R. Ade, A. Adler, E. Allys, D. Alonso, K. Arnold, D. Auguste, J. Aumont, R. Aurlien, J. Austermann, S. Azzoni, C. Baccigalupi, A. J. Banday, R. Banerji, R. B. Barreiro, N. Bartolo, S. Basak, E. Battistelli, L. Bautista, J. Beall, D. Beck, S. Beckman, K. Benabed, J. Bermejo-Ballesteros, M. Bersanelli, J. Bonis, J. Borrill, F. Bouchet, F. Boulanger, S. Bounissou, M. Brilenkov, M. L. Brown, M. Bucher, E. Calabrese, M. Calvo, P. Campeti, A. Carones, F. J. Casas, A. Catalano, A. Challinor, V. Chan, K. Cheung, Y. Chinone, J. Cliche, F. Columbro, W. Coulton, J. Cubas, A. Cukierman, D. Curtis, G. D’Alessandro, K. Dachlythra, P. de Bernardis, T. de Haan, E. de la Hoz, M. De Petris, S. Della Torre, C. Dickinson, P. Diego-Palazuelos, M. Dobbs, T. Dotani, D. Douillet, L. Duband, A. Ducout, S. Duff, J. M. Duval, K. Ebisawa, T. Elleflot, H. K. Eriksen, J. Errard, T. Essinger-Hileman, F. Finelli, R. Flauger, C. Franceschet, U. Fuskeland, S. Galli, M. Galloway, K. Ganga, J. R. Gao, R. T. Genova-Santos, M. Gerbino, M. Gervasi, T. Ghigna, S. Giardiello, E. Gjerløw, M. L. Gradziel, J. Grain, L. Grandsire, F. Grupp, A. Gruppuso, J. E. Gudmundsson, N. W. Halverson, J. Hamilton, P. Hargrave, M. Hasegawa, M. Hattori, M. Hazumi, S. Henrot-Versillé, L. T. Hergt, D. Herman, D. Herranz, C. A. Hill, G. Hilton, E. Hivon, R. A. Hlozek, T. D. Hoang, A. L. Hornsby, Y. Hoshino, J. Hubmayr, K. Ichiki, T. Iida, H. Imada, K. Ishimura, H. Ishino, G. Jaehnig, M. Jones, T. Kaga, S. Kashima, N. Katayama, A. Kato, T. Kawasaki, R. Keskitalo, T. Kisner, Y. Kobayashi, N. Kogiso, A. Kogut, K. Kohri, E. Komatsu, K. Komatsu, K. Konishi, N. Krachmalnicoff, I. Kreykenbohm, C. L. Kuo, A. Kushino, L. Lamagna, J. V. Lanen, G. Laquaniello, M. Lattanzi, A. T. Lee, C. Leloup, F. Levrier, E. Linder, T. Louis, G. Luzzi, J. Macias-Perez, T. Maciaszek, B. Maffei, D. Maino, M. Maki, S. Mandelli, M. Maris, E. Martínez-González, S. Masi, M. Massa, S. Matarrese, F. T. Matsuda, T. Matsumura, L. Mele, A. Mennella, M. Migliaccio, Y. Minami, K. Mitsuda, A. Moggi, A. Monfardini, J. Montgomery, L. Montier, G. Morgante, B. Mot, Y. Murata, J. A. Murphy, M. Nagai, Y. Nagano, T. Nagasaki, R. Nagata, S. Nakamura, R. Nakano, T. Namikawa, F. Nati, P. Natoli, S. Nerval, T. Nishibori, H. Nishino, F. Noviello, C. O’Sullivan, K. Odagiri, H. Ogawa, H. Ogawa, S. Oguri, H. Ohsaki, I. S. Ohta, N. Okada, N. Okada, L. Pagano, A. Paiella, D. Paoletti, A. Passerini, G. Patanchon, V. Pelgrim, J. Peloton, F. Piacentini, M. Piat, G. Pisano, G. Polenta, D. Poletti, T. Prouvé, G. Puglisi, D. Rambaud, C. Raum, S. Realini, M. Reinecke, M. Remazeilles, A. Ritacco, G. Roudil, J. Rubino-Martin, M. Russell, H. Sakurai, Y. Sakurai, M. Sandri, M. Sasaki, G. Savini, D. Scott, J. Seibert, Y. Sekimoto, B. Sherwin, K. Shinozaki, M. Shiraishi, P. Shirron, G. Signorelli, G. Smecher, F. Spinella, S. Stever, R. Stompor, S. Sugiyama, R. Sullivan, A. Suzuki, J. Suzuki, T. L. Svalheim, E. Switzer, R. Takaku, H. Takakura, S. Takakura, Y. Takase, Y. Takeda, A. Tartari, D. Tavagnacco, A. Taylor, E. Taylor, Y. Terao, J. Thermeau, H. Thommesen, K. L. Thompson, B. Thorne, T. Toda, M. Tomasi, M. Tominaga, N. Trappe, M. Tristram, M. Tsuji, M. Tsujimoto, C. Tucker, J. Ullom, L. Vacher, G. Vermeulen, P. Vielva, F. Villa, M. Vissers, N. Vittorio, B. Wandelt, W. Wang, K. Watanuki, I. K. Wehus, J. Weller, B. Westbrook, J. Wilms, B. Winter, E. J. Wollack, N. Y. Yamasaki, T. Yoshida, J. Yumoto, A. Zacchei, M. Zannoni, A. Zonca

    Journal of Low Temperature Physics   211 ( 5-6 )   384 - 397   2022.12

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s10909-022-02921-7

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    Other Link： https://link.springer.com/article/10.1007/s10909-022-02921-7/fulltext.html

  • Probing cosmic inflation with theLiteBIRDcosmic microwave background polarization survey Reviewed

    E Allys, K Arnold, J Aumont, R Aurlien, S Azzoni, C Baccigalupi, A J Banday, R Banerji, R B Barreiro, N Bartolo, L Bautista, D Beck, S Beckman, M Bersanelli, F Boulanger, M Brilenkov, M Bucher, E Calabrese, P Campeti, A Carones, F J Casas, A Catalano, V Chan, K Cheung, Y Chinone, S E Clark, F Columbro, G D’Alessandro, P de Bernardis, T de Haan, E de la Hoz, M De Petris, S Della Torre, P Diego-Palazuelos, M Dobbs, T Dotani, J M Duval, T Elleflot, H K Eriksen, J Errard, T Essinger-Hileman, F Finelli, R Flauger, C Franceschet, U Fuskeland, M Galloway, K Ganga, M Gerbino, M Gervasi, R T Génova-Santos, T Ghigna, S Giardiello, E Gjerløw, J Grain, F Grupp, A Gruppuso, J E Gudmundsson, N W Halverson, P Hargrave, T Hasebe, M Hasegawa, M Hazumi, S Henrot-Versillé, B Hensley, L T Hergt, D Herman, E Hivon, R A Hlozek, A L Hornsby, Y Hoshino, J Hubmayr, K Ichiki, T Iida, H Imada, H Ishino, G Jaehnig, N Katayama, A Kato, R Keskitalo, T Kisner, Y Kobayashi, A Kogut, K Kohri, E Komatsu, K Komatsu, K Konishi, N Krachmalnicoff, C L Kuo, L Lamagna, M Lattanzi, A T Lee, C Leloup, F Levrier, E Linder, G Luzzi, J Macias-Perez, T Maciaszek, B Maffei, D Maino, S Mandelli, E Martínez-González, S Masi, M Massa, S Matarrese, F T Matsuda, T Matsumura, L Mele, M Migliaccio, Y Minami, A Moggi, J Montgomery, L Montier, G Morgante, B Mot, Y Nagano, T Nagasaki, R Nagata, R Nakano, T Namikawa, F Nati, P Natoli, S Nerval, F Noviello, K Odagiri, S Oguri, H Ohsaki, L Pagano, A Paiella, D Paoletti, A Passerini, G Patanchon, F Piacentini, M Piat, G Pisano, G Polenta, D Poletti, T Prouvé, G Puglisi, D Rambaud, C Raum, S Realini, M Reinecke, M Remazeilles, A Ritacco, G Roudil, J A Rubino-Martin, M Russell, H Sakurai, Y Sakurai, M Sasaki, D Scott, Y Sekimoto, K Shinozaki, M Shiraishi, P Shirron, G Signorelli, F Spinella, S Stever, R Stompor, S Sugiyama, R M Sullivan, A Suzuki, T L Svalheim, E Switzer, R Takaku, H Takakura, Y Takase, A Tartari, Y Terao, J Thermeau, H Thommesen, K L Thompson, M Tomasi, M Tominaga, M Tristram, M Tsuji, M Tsujimoto, L Vacher, P Vielva, N Vittorio, W Wang, K Watanuki, I K Wehus, J Weller, B Westbrook, J Wilms, B Winter, E J Wollack, J Yumoto, M Zannoni

    Progress of Theoretical and Experimental Physics   2023 ( 4 )   2022.11

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

    Abstract

    LiteBIRD, the Lite (Light) satellite for the study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission for primordial cosmology and fundamental physics. The Japan Aerospace Exploration Agency (JAXA) selected LiteBIRD in May 2019 as a strategic large-class (L-class) mission, with an expected launch in the late 2020s using JAXA’s H3 rocket. LiteBIRD is planned to orbit the Sun–Earth Lagrangian point L2, where it will map the cosmic microwave background polarization over the entire sky for three years, with three telescopes in 15 frequency bands between 34 and 448 GHz, to achieve an unprecedented total sensitivity of $2.2\, \mu$K-arcmin, with a typical angular resolution of 0.5○ at 100 GHz. The primary scientific objective of LiteBIRD is to search for the signal from cosmic inflation, either making a discovery or ruling out well-motivated inflationary models. The measurements of LiteBIRD will also provide us with insight into the quantum nature of gravity and other new physics beyond the standard models of particle physics and cosmology. We provide an overview of the LiteBIRD project, including scientific objectives, mission and system requirements, operation concept, spacecraft and payload module design, expected scientific outcomes, potential design extensions, and synergies with other projects.

    DOI： 10.1093/ptep/ptac150

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    Other Link： https://academic.oup.com/ptep/article-pdf/2023/4/042F01/50954267/ptac150.pdf

  • Vibration Characteristics of a Continuously Rotating Superconducting Magnetic Bearing and Potential Influence to TES and SQUID Reviewed

    S. Sugiyama, T. Ghigna, Y. Hoshino, N. Katayama, S. Katsuda, K. Komatsu, T. Matsumura, Y. Sakurai, K. Sato, R. Takaku, M. Tashiro, Y. Terada

    Journal of Low Temperature Physics   209 ( 5-6 )   1088 - 1096   2022.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s10909-022-02846-1

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    Other Link： https://link.springer.com/article/10.1007/s10909-022-02846-1/fulltext.html

  • Testing magnetic interference between TES detectors and the telescope environment for future CMB satellite missions

    Tommaso Ghigna, Thuong D. Hoang, Takashi Hasebe, Yurika Hoshino, Nobuhiko Katayama, Kunimoto Komatsu, Adrian T. Lee, Tomotake Matsumura, Yuki Sakurai, Shinya Sugiyama, Aritoki Suzuki, Christopher R. Raum, Ryota Takaku, Benjamin Westbrook

    Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI   167 - 167   2022.8

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2630091

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  • Impact of the effective thickness from anti-reflective sub-wavelength structures in achromatic half-wave plate design

    Ryota Takaku, Susanna Azzoni, Tommaso Ghigna, Takashi Hasebe, Thuong D. Hoang, Yurika Hoshino, Nobuhiko Katayama, Kunimoto Komatsu, Kuniaki Konishi, Makoto Gonokami, Tomotake Matsumura, Haruyuki Sakurai, Yuki Sakurai, Shinya Sugiyama, Noriko Y. Yamasaki, Junji Yumoto

    Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI   162 - 162   2022.8

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2629213

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  • Testbed preparation of a small prototype polarization modulator for LiteBIRD low-frequency telescope

    Thuong D. Hoang, Tomotake Matsumura, Ryota Takaku, Takashi Hasebe, Tommaso Ghigna, Nobuhiko Katayama, Yuki Sakurai, Kunimoto Komatsu, Teruhito Iida, Yurika Hoshino, Shinya Sugiyama, Hirokazu Ishino

    Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI   169 - 169   2022.8

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2630653

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  • Instrumental Performance and Scientific Requirements of Polarization Modulation Unit for LiteBIRD low frequency telescope

    Yuki Sakurai, Tomotake Matsumura, Nobuhiko Katayama, Kunimoto Komatsu, Ryota Takaku, Shinya Sugiyama, Yurika Hoshino, Takashi Hasebe, Tommaso Ghigna, Thuong D. Hoang, Teruhito Iida, Yusuke Takase, Hirokazu Ishino, Masashi Hazumi, Hiroyuki Ohsaki, Yutaka Terao, Takemi Onoue, Satsuki Okumura, Kuniaki Konishi, Junji Yumoto, Haruyuki Sakurai, Makoto K. Gonokami, Akito Kusaka

    Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI   166 - 166   2022.8

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2629102

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  • Heat dissipation of rotation mechanism of polarization modulator unit for LiteBIRD low-frequency telescope

    Takashi Hasebe, Tommaso Ghigna, Thuong D. Hoang, Yurika Hoshino, Teruhito Iida, Nobuhiko Katayama, Tomotake Matsumura, Hiroyuki Ohsaki, Yuki Sakurai, Shinya Sugiyama, Ryota Takaku, Yutaka Terao

    Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave   232 - 232   2022.8

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2630636

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  • Picosecond laser ablation of millimeter-wave subwavelength structures on alumina and sapphire Reviewed

    Qi Wen, Elena Fadeeva, Shaul Hanany, Jürgen Koch, Tomotake Matsumura, Ryota Takaku, Karl Young

    Optics & Laser Technology   142   107207 - 107207   2021.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.optlastec.2021.107207

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  • Design and demonstration of the frequency independent fast axis of the Pancharatnam base multi-layer half-wave plate for CMB polarization experiment

    Kunimoto Komatsu, Hirokazu Ishino, Nobuhiko Katayama, Tomotake Matsumura, Yuki Sakurai, Ryota Takaku

    Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X   147 - 147   2020.12

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2562092

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  • 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 Yamasaki, Karl Young, Junji Yumoto

    Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X   49 - 49   2020.12

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2562028

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  • Evaluation of reconstructed angular error of a continuous rotating HWP for LiteBIRD

    Shinya Sugiyama, Tomotake Matsumura, Yuki Sakurai, Nobuhiko Katayama, Satoru Takakura, Makoto Tashiro, Yukikatsu Terada, Kosuke Sato, Satoru Katsuda, Yurika Hoshino, Ryota Takaku, Kunimoto Komatsu

    Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave   276 - 276   2020.12

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2576290

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  • Breadboard model of polarization modulator unit based on a continuously rotating half-wave plate for the low-frequency telescope of the LiteBIRD space mission

    Yuki Sakurai, Tomotake Matsumura, Nobuhiko Katayama, Kunimoto Komatsu, Ryota Takaku, Shinya Sugiyama, Yoshiki Nomura, Takayuki Toda, Tommaso Ghigna, Teruhito Iida, Hajime Sugai, Hiroaki Imada, Masashi Hazumi, Hirokazu Ishino, Hiroyuki Ohsaki, Yutaka Terao, Hisashi Enokida, Yusuke Ishida, Yosuke Iwata, Doa Jamil, Kuniaki Konishi, Haruyuki Sakurai, Junji Yumoto, Makoto Kuwata-Gonokami, Akito Kusaka, Charles Hill

    Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X   162 - 162   2020.12

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2560289

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  • Terahertz broadband anti-reflection moth-eye structures fabricated by femtosecond laser processing Reviewed

    Haruyuki Sakurai, Natsuki Nemoto, Kuniaki Konishi, Ryota Takaku, Yuki Sakurai, Nobuhiko Katayama, Tomotake Matsumura, Junji Yumoto, Makoto Kuwata-Gonokami

    OSA Continuum   2 ( 9 )   2764 - 2764   2019.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

    DOI： 10.1364/osac.2.002764

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    Other Link： https://www.osapublishing.org/viewmedia.cfm?URI=osac-2-9-2764&seq=0

  • LiteBIRD: A Satellite for the Studies of B-Mode Polarization and Inflation from Cosmic Background Radiation Detection Reviewed

    M. Hazumi, P. A. R. Ade, Y. Akiba, D. Alonso, K. Arnold, J. Aumont, C. Baccigalupi, D. Barron, S. Basak, S. Beckman, J. Borrill, F. Boulanger, M. Bucher, E. Calabrese, Y. Chinone, S. Cho, A. Cukierman, D. W. Curtis, T. de Haan, M. Dobbs, A. Dominjon, T. Dotani, L. Duband, A. Ducout, J. Dunkley, J. M. Duval, T. Elleflot, H. K. Eriksen, J. Errard, J. Fischer, T. Fujino, T. Funaki, U. Fuskeland, K. Ganga, N. Goeckner-Wald, J. Grain, N. W. Halverson, T. Hamada, T. Hasebe, M. Hasegawa, K. Hattori, M. Hattori, L. Hayes, N. Hidehira, C. A. Hill, G. Hilton, J. Hubmayr, K. Ichiki, T. Iida, H. Imada, M. Inoue, Y. Inoue, K. D. Irwin, H. Ishino, O. Jeong, H. Kanai, D. Kaneko, S. Kashima, N. Katayama, T. Kawasaki, S. A. Kernasovskiy, R. Keskitalo, A. Kibayashi, Y. Kida, K. Kimura, T. Kisner, K. Kohri, E. Komatsu, K. Komatsu, C. L. Kuo, N. A. Kurinsky, A. Kusaka, A. Lazarian, A. T. Lee, D. Li, E. Linder, B. Maffei, A. Mangilli, M. Maki, T. Matsumura, S. Matsuura, D. Meilhan, S. Mima, Y. Minami, K. Mitsuda, L. Montier, M. Nagai, T. Nagasaki, R. Nagata, M. Nakajima, S. Nakamura, T. Namikawa, M. Naruse, H. Nishino, T. Nitta, T. Noguchi, H. Ogawa, S. Oguri, N. Okada, A. Okamoto, T. Okamura, C. Otani, G. Patanchon, G. Pisano, G. Rebeiz, M. Remazeilles, P. L. Richards, S. Sakai, Y. Sakurai, Y. Sato, N. Sato, M. Sawada, Y. Segawa, Y. Sekimoto, U. Seljak, B. D. Sherwin, T. Shimizu, K. Shinozaki, R. Stompor, H. Sugai, H. Sugita, A. Suzuki, J. Suzuki, O. Tajima, S. Takada, R. Takaku, S. Takakura, S. Takatori, D. Tanabe, E. Taylor, K. L. Thompson, B. Thorne, T. Tomaru, T. Tomida, N. Tomita, M. Tristram, C. Tucker, P. Turin, M. Tsujimoto, S. Uozumi, S. Utsunomiya, Y. Uzawa, F. Vansyngel, I. K. Wehus, B. Westbrook, M. Willer, N. Whitehorn, Y. Yamada, R. Yamamoto, N. Yamasaki, T. Yamashita, M. Yoshida

    Journal of Low Temperature Physics   194 ( 5-6 )   443 - 452   2019.2

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s10909-019-02150-5

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    Other Link： http://link.springer.com/content/pdf/10.1007/s10909-019-02150-5.pdf

  • Concept Study of Optical Configurations for High-Frequency Telescope for LiteBIRD Reviewed

    T. Hasebe, S. Kashima, P. A. R. Ade, Y. Akiba, D. Alonso, K. Arnold, J. Aumont, C. Baccigalupi, D. Barron, S. Basak, S. Beckman, J. Borrill, F. Boulanger, M. Bucher, E. Calabrese, Y. Chinone, H.-M. Cho, A. Cukierman, D. W. Curtis, T. de Haan, M. Dobbs, A. Dominjon, T. Dotani, L. Duband, A. Ducout, J. Dunkley, J. M. Duval, T. Elleflot, H. K. Eriksen, J. Errard, J. Fischer, T. Fujino, T. Funaki, U. Fuskeland, K. Ganga, N. Goeckner-Wald, J. Grain, N. W. Halverson, T. Hamada, M. Hasegawa, K. Hattori, M. Hattori, L. Hayes, M. Hazumi, N. Hidehira, C. A. Hill, G. Hilton, J. Hubmayr, K. Ichiki, T. Iida, H. Imada, M. Inoue, Y. Inoue, K. D. Irwin, H. Ishino, O. Jeong, H. Kanai, D. Kaneko, N. Katayama, T. Kawasaki, S. A. Kernasovskiy, R. Keskitalo, A. Kibayashi, Y. Kida, K. Kimura, T. Kisner, K. Kohri, E. Komatsu, K. Komatsu, C. L. Kuo, N. A. Kurinsky, A. Kusaka, A. Lazarian, A. T. Lee, D. Li, E. Linder, B. Maffei, A. Mangilli, M. Maki, T. Matsumura, S. Matsuura, D. Meilhan, S. Mima, Y. Minami, K. Mitsuda, L. Montier, M. Nagai, T. Nagasaki, R. Nagata, M. Nakajima, S. Nakamura, T. Namikawa, M. Naruse, H. Nishino, T. Nitta, T. Noguchi, H. Ogawa, S. Oguri, N. Okada, A. Okamoto, T. Okamura, C. Otani, G. Patanchon, G. Pisano, G. Rebeiz, M. Remazeilles, P. L. Richards, S. Sakai, Y. Sakurai, Y. Sato, N. Sato, M. Sawada, Y. Segawa, Y. Sekimoto, U. Seljak, B. D. Sherwin, T. Shimizu, K. Shinozaki, R. Stompor, H. Sugai, H. Sugita, A. Suzuki, J. Suzuki, O. Tajima, S. Takada, R. Takaku, S. Takakura, S. Takatori, D. Tanabe, E. Taylor, K. L. Thompson, B. Thorne, T. Tomaru, T. Tomida, N. Tomita, M. Tristram, C. Tucker, P. Turin, M. Tsujimoto, S. Uozumi, S. Utsunomiya, Y. Uzawa, F. Vansyngel, I. K. Wehus, B. Westbrook, M. Willer, N. Whitehorn, Y. Yamada, R. Yamamoto, N. Yamasaki, T. Yamashita, M. Yoshida

    Journal of Low Temperature Physics   193 ( 5-6 )   841 - 850   2018.5

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s10909-018-1915-2

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    Other Link： http://link.springer.com/content/pdf/10.1007/s10909-018-1915-2.pdf

  • The LiteBIRD Satellite Mission: Sub-Kelvin Instrument Reviewed

    A. Suzuki, P. A. R. Ade, Y. Akiba, D. Alonso, K. Arnold, J. Aumont, C. Baccigalupi, D. Barron, S. Basak, S. Beckman, J. Borrill, F. Boulanger, M. Bucher, E. Calabrese, Y. Chinone, S. Cho, B. Crill, A. Cukierman, D. W. Curtis, T. de Haan, M. Dobbs, A. Dominjon, T. Dotani, L. Duband, A. Ducout, J. Dunkley, J. M. Duval, T. Elleflot, H. K. Eriksen, J. Errard, J. Fischer, T. Fujino, T. Funaki, U. Fuskeland, K. Ganga, N. Goeckner-Wald, J. Grain, N. W. Halverson, T. Hamada, T. Hasebe, M. Hasegawa, K. Hattori, M. Hattori, L. Hayes, M. Hazumi, N. Hidehira, C. A. Hill, G. Hilton, J. Hubmayr, K. Ichiki, T. Iida, H. Imada, M. Inoue, Y. Inoue, K. D. Irwin, H. Ishino, O. Jeong, H. Kanai, D. Kaneko, S. Kashima, N. Katayama, T. Kawasaki, S. A. Kernasovskiy, R. Keskitalo, A. Kibayashi, Y. Kida, K. Kimura, T. Kisner, K. Kohri, E. Komatsu, K. Komatsu, C. L. Kuo, N. A. Kurinsky, A. Kusaka, A. Lazarian, A. T. Lee, D. Li, E. Linder, B. Maffei, A. Mangilli, M. Maki, T. Matsumura, S. Matsuura, D. Meilhan, S. Mima, Y. Minami, K. Mitsuda, L. Montier, M. Nagai, T. Nagasaki, R. Nagata, M. Nakajima, S. Nakamura, T. Namikawa, M. Naruse, H. Nishino, T. Nitta, T. Noguchi, H. Ogawa, S. Oguri, N. Okada, A. Okamoto, T. Okamura, C. Otani, G. Patanchon, G. Pisano, G. Rebeiz, M. Remazeilles, P. L. Richards, S. Sakai, Y. Sakurai, Y. Sato, N. Sato, M. Sawada, Y. Segawa, Y. Sekimoto, U. Seljak, B. D. Sherwin, T. Shimizu, K. Shinozaki, R. Stompor, H. Sugai, H. Sugita, J. Suzuki, O. Tajima, S. Takada, R. Takaku, S. Takakura, S. Takatori, D. Tanabe, E. Taylor, K. L. Thompson, B. Thorne, T. Tomaru, T. Tomida, N. Tomita, M. Tristram, C. Tucker, P. Turin, M. Tsujimoto, S. Uozumi, S. Utsunomiya, Y. Uzawa, F. Vansyngel, I. K. Wehus, B. Westbrook, M. Willer, N. Whitehorn, Y. Yamada, R. Yamamoto, N. Yamasaki, T. Yamashita, M. Yoshida

    Journal of Low Temperature Physics   193 ( 5-6 )   1048 - 1056   2018.5

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s10909-018-1947-7

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MISC

  • Application of Laser Processed Microstructures for Astrophysics and Cosmology Reviewed

    Ryota Takaku, Haruyuki Sakurai, Kuniaki Konishi, Tomotake Matsumura

    53 ( 1 )   31 - 36   2025.1

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    Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

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Presentations

  • Large diameter Millimeter-Wave Low-Pass Filter Made of Alumina with Laser Ablated Anti-reflection Coating

    Ryota Takaku, Qi Wen, S. Cray, M. Devlin, S. Dicker, S. Hanany, T. Hasebe, T. Iida, N. Katayama, K. Konishi, M. Kuwata-Gonokami, T. Matsumura, N. Mio, H. Sakurai, Y. Sakurai, R. Yamada, J. Yumoto

    16 th international conference of laser ablation  2022.4.28 

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    Event date： 2022.4.25 - 2022.4.29

    Language：English   Presentation type：Oral presentation (general)  

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  • 超短パルスレーザーによるモスアイ反射防止構造加工を施した大型アルミナIRフィルターの開発

    高久諒太, Qi Wen^A., Scott Cray^A., Mark Devlin^B., Simon Dicker^B., Shaul Hanany^A., 長谷部孝, 飯田輝人^C., 片山伸彦, 小西邦昭, 五神真, 松村知岳, 三尾典克, 櫻井治之, 桜井雄基^D., 山田涼平, 湯本潤司

    日本物理学会 第77回年次大会  2022.3.16 

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    Event date： 2022.3.14 - 2022.3.18

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 太陽ニュートリノ観測を目的としたIn標的超伝導検出器の開発 Invited

    高久 諒太, 石野 宏和, 樋口 光宏, 柿木 健杜, 福島太智, 山森 弘毅

    低温プラットフォーム意見交換会  2025.12.16 

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    Event date： 2025.12.16

    Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

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  • ミリ波光学素子に向けた超短パルスレーザー加工で作製する六角格子モスアイ反射防止構造

    高久諒太, 松村知岳, 小西邦昭, 櫻井治之, 川野将太郎

    日本物理学会2025年年次大会  2025.9.16 

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    Event date： 2025.9.16 - 2025.9.19

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Development of Electron Neutrino Detectors Using MKID and Indium Targets with Micro-Machined Mask

    Ryota Takaku, Ryuji Omae, Mitsuhito Higuchi, Hirokazu Ishino, Kento Kakinoki, Hirotake Yamamori

    21st International Workshop on Low Temperature Detectors (LTD21)  2025.6.3 

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    Event date： 2025.6.1 - 2025.6.6

    Language：English   Presentation type：Poster presentation  

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  • LiteBIRD HWP Invited

    Ryota Takaku

    CMB B-mode-NEXT  2025.1.28 

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    Event date： 2025.1.27 - 2025.1.29

    Language：English   Presentation type：Symposium, workshop panel (nominated)  

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  • Optical characterizations of scaled model of low frequency telescope and a broadband achromatic half-wave plate

    Ryota Takaku, Masaya Hasegawa, Haruaki Hirose

    QUPosium2024  2024.12.10 

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    Event date： 2024.12.9 - 2024.12.11

    Language：English   Presentation type：Poster presentation  

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  • Development status of the polarization modulator using 330 mm diameter sapphire-based achromatic half-wave plate for LiteBIRD

    Ryota Takaku, Thuong Duc Hoang, Tomotake Matsumura, Asuka Maeda, Clément Leloup, Mitsuharu Kusama, Ryosuke Akizawa, Kosuke Aizawa, Yuki Sakurai, Ryota Uematsu, Kiyoshi Ikuma, Hiroyuki Ohsaki, Satsuki Okumura, Yutaka Terao, Kuniaki Konishi, Haruyuki Sakurai, Teruhito Iida, Gilberto Goracci, LiteBIRD collaboration

    SPIE Astronomical Telescopes + Instrumentation  2024.6.17 

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    Event date： 2024.6.16 - 2024.6.21

    Language：English   Presentation type：Poster presentation  

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  • LiteBIRD低周波望遠鏡における広帯域サファイア半波長板の設計のための感度評価

    高久諒太, Ghigna Tommaso, Hoang D. Thuong, 松村知岳, 桜井雄基, 片山伸彦, 相澤耕佑, 秋澤涼介, LiteBIRD collaborations

    日本物理学会 第78回年次大会  2023.9.17 

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    Event date： 2023.9.16 - 2023.9.19

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Relative sensitivity dependence for design of sapphire-based broadband half-wave plate with anti-reflective sub-wavelength structures

    Ryota Takaku, Tommaso Ghigna, Takashi Hasebe, Thuong D. Hoang, Nobuhiko Katayama, Tomotake Matsumura, Yuki Sakurai, LiteBIRD collaborations

    The 20th International Conference on Low Temperature Detectors (LTD)  2023.7.25 

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    Event date： 2023.7.23 - 2023.7.28

    Language：English   Presentation type：Poster presentation  

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  • Evaluation of instrumental polarization induced by broadband achromatic half-wave plate with anti-reflective structures

    Ryota Takaku, S. Azzoni, T. Ghigna, S. Hanany, T. Hasebe, T. Hoang, Y. Hoshino, N. Katayama, K. Komatsu, K. Konishi, M. Kuwata-Gonokami, T. Matsumura, H. Sakurai, Y. Sakurai, S. Sugiyama, N. N. Yamasaki, J. Yumoto

    SPIE Astronimical Telescope + Instrumentation 2020, Millimeter, Submillimeter, and Far-infrared Detectors and Instrumentation for Astronomy X  2022.7.21 

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    Event date： 2022.7.17 - 2022.7.22

    Language：English   Presentation type：Poster presentation  

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  • LiteBIRD低周波望遠鏡のためのモスアイ反射防止広帯域サファイア半波長板の開発

    高久 諒太, 小松 国幹, Azzoni Sussana, Ghigna Tommaso, 長谷部 孝, Hoang Thuong, 星野 百合香, 片山 伸彦, 松村 知岳, 桜井 雄基, 杉山 真也

    第22回宇宙科学シンポジウム  2022.1.6 

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    Event date： 2022.1.6 - 2022.1.7

    Language：Japanese   Presentation type：Symposium, workshop panel (public)  

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  • Development of broadband achromatic HWP with anti-reflective structures

    Ryota Takaku, Kunimoto Komatsu, Sussana Azzoni, Tommaso Ghigna, Takashi Hasebe, Thuong Duc Hoang, Yurika Hoshino, Nobuhiko Katayama, Tomotake Matsumura, Yuki Sakurai, Shinya Sugiyama

    CMB INFLATE Kick-off symposium  2021.11.24 

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    Event date： 2021.11.22 - 2021.12.3

    Language：English   Presentation type：Oral presentation (general)  

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  • LiteBIRDに向けた 200 mm径モスアイ多層半波長板の光学評価とTES非線形効果への影響

    高久諒太, 松村知岳, 櫻井治之, 小西邦昭, Shaul Hanany, Qi Wen, 桜井雄基, 片山伸彦, Tommaso Ghigna, 長谷部孝, 小松国幹, 石野宏和, 山﨑典子, 星野百合香, 湯本潤司, 五神真

    日本物理学会2021年秋季大会  2021.9.15 

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    Event date： 2021.9.14 - 2021.9.17

    Language：Japanese  

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  • Evaluation of instrumental polarization of a 200 mm diameter achromatic HWP with anti-reflective structures and impact on TES non-linearity

    Ryota Takaku, Tommaso Ghigna, Shaul Hanany, Yurika Hoshino, Hirokazu Ishino, Nobuhiko Katayama, Kunimoto Komatsu, Kuniaki Konishi, Makoto Kuwata-Gonokami, Tomotake Matsumura, Haruyuki Sakurai, Yuki Sakurai, Qi Wen, Noriko Y. Yamasaki, Junji Yumoto

    19th International Workshop on Low Temperature Detectors (LTD19)  2021.7.29 

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    Event date： 2021.7.19 - 2021.7.29

    Language：English   Presentation type：Poster presentation  

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  • 超短パルスレーザー加工を用いたCMB偏光観測のためのアルミナIRフィルターの広帯域反射防止構造の開発

    高久 諒太, 松村 知岳, 櫻井 治之, 小西 邦昭, Shaul Hanany, Qi Wen, 桜井 雄基, 片山 伸彦, 山﨑 典子, 星野 百合香, 湯本 潤司, 五神 真

    日本物理学会 第76回年次大会  2021.3.13 

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    Event date： 2021.3.12 - 2021.3.15

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 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

    SPIE Astronimical Telescope + Instrumentation 2020, Millimeter, Submillimeter, and Far-infrared Detectors and Instrumentation for Astronomy X  2020.12.18 

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    Event date： 2020.12.14 - 2020.12.18

    Language：English  

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  • LiteBIRD偏光変調器に向けたサファイア広帯域反射防止構造の大面積レーザー加工の手法と光学評価

    高久 諒太, 松村 知岳, 桜井 治之, 小西 邦昭, 今田 大皓, Shaul Hanany, Karl Young, Qi Wen, 桜井 雄基, 片山 伸彦, 満田 和久, 山﨑 典子, 小松 国幹, 石野 宏和, 湯本 潤司, 五神 真

    2020年日本物理学会 秋季大会  2020.9.14 

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    Event date： 2020.9.14 - 2020.9.17

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • The development of SWS as a broadband AR in a large area using laser ablation for LFT HWP

    R. Takaku, T. Matsumura, H. Sakurai, K. Konishi, H. Imada, S. Hanany, K. Young, Q. Wen, Y. Sakurai, N. Katayama, K. Mitsuda, N. Yamasaki, K. Komatsu, H. Ishino, Y. Kobayashi, J. Yumoto, M. Kuwata-Gonokami

    B-mode from space  2019.12.16 

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    Event date： 2019.12.16 - 2019.12.19

    Language：English   Presentation type：Poster presentation  

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  • 超短パルスレーザーを用いたCMB偏光観測衛星LiteBIRDのための広帯域反射防止構造の大面積加工とその光学評価

    高久 諒太, 松村 知岳, 桜井 治之, 小西 邦昭, 今田 大皓, Shaul Hanany, Karl Young, Qi Wen, 桜井 雄基, 片山 伸彦, 満田 和久, 山﨑 典子, 小松 国幹, 石野 宏和, 湯本 潤司, 五神 真

    日本物理学会 第75回年次大会 

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    Language：Japanese  

    File： ryota_jps202003_spring.pdf

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Awards

  • 東京大学大学院理学系研究科奨励賞

    2023.3   東京大学  

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Research Projects

  • 宇宙のインフレーション探査を目指した広帯域・大型・極低温偏光変調器の開発

    Grant number：24K17064  2024.04 - 2027.03

    日本学術振興会  科学研究費助成事業  若手研究

    高久 諒太

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    Grant amount：\4680000 （ Direct expense: \3600000 、 Indirect expense：\1080000 ）

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  • Evaluation of cosmic inflation by CMB polarization modulator with laser ablated moth-eye structures

    Grant number：22KJ0926  2023.03 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

    高久 諒太

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    Grant amount：\1100000 （ Direct expense: \1100000 ）

    インフレーション仮説の検証に向けた広帯域偏光変調器の開発において、超短パルスレーザー加工を用いて作製されたモスアイ構造を波長板に施し、広帯域で機能する波長板を開発した。本年度は広帯域波長板として異なる2つの設計に対して感度の見積りを行った結果をまとめ、国際学会Low Temperature Detectorへ発表した。同時にその結果をJournal of Low Temperature Physicsへと投稿した。また、インフレーション検証を目指した衛星計画LiteBIRDの全体Face to face meetingへと参加し、現行する偏光変調器開発の全体進捗をポスターにまとめて共有した。その上で、波長板だけでなく波長板を回転させるための回転機構の低温試験もリードし、偏光変調器開発チームの中心を担った。実際の回転機構の冷却試験では、目的の周波数を十分な時間で維持できることを確認した。
    本研究において超短パルスレーザー加工を用いたモスアイ構造の作製手法の開発により、世界最高帯域での観測を要求するLiteBIRD低周波望遠鏡でも十分に機能するほど広帯域な半波長板の開発に成功しただけでなく、その波長板を実際の望遠鏡に施した場合の感度の見積もりがideal case(反射や吸収による効率の低下がない場合)と十分に差異がないことを示した。また、得られた感度をインプットとして前景放射の効果も含めたテンソル・スカラー比の見積もりも統計的にideal caseと十分に差異がないことも示した。現在は系統誤差を含めた波長板の作製・評価、そして実機サイズを実際に加工するべく調整を進めている。

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  • Evaluation of cosmic inflation by CMB polarization modulator with laser ablated moth-eye structures

    Grant number：22J13975  2022.04 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

    高久 諒太

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    Grant amount：\1100000 （ Direct expense: \1100000 ）

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  • Scientists Make a New Type of Optical Device Using Alumina

    2022.01

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