Faculty Profiles - 松山　智至

Papers - 松山　智至

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Extreme focusing of hard X-ray free-electron laser pulses enables 7 nm focus width and 1022 W cm−2 intensity Reviewed Open Access

Jumpei Yamada, Satoshi Matsuyama, Ichiro Inoue, Taito Osaka, Takato Inoue, Nami Nakamura, Yuto Tanaka, Yuichi Inubushi, Toshinori Yabuuchi, Kensuke Tono, Kenji Tamasaku, Hirokatsu Yumoto, Takahisa Koyama, Haruhiko Ohashi, Makina Yabashi, Kazuto Yamauchi

Nature Photonics Vol. 18 ( 7 ) page： 685 - 690 2024.7

Monolithic deformable mirror based on lithium niobate single crystal for high-resolution X-ray adaptive microscopy Reviewed Open Access

Takato Inoue, Sota Nakabayashi, Kota Uematsu, Yuto Tanaka, Hiroki Nakamori, Yoshiki Kohmura, Makina Yabashi, Satoshi Matsuyama

Optica Vol. 11 ( 5 ) page： 621 - 625 2024.5

Multi-frame blind deconvolution using X-ray microscope images of an in-plane rotating sample Reviewed Open Access

Kurimoto, S; Inoue, T; Aoto, H; Ito, T; Ito, S; Kohmura, Y; Yabashi, M; Matsuyama, S

SCIENTIFIC REPORTS Vol. 14 ( 1 ) page： 29726 2024.11

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Scientific Reports

We propose a multi-frame blind deconvolution method using an in-plane rotating sample optimized for X-ray microscopy, where the application of existing deconvolution methods is technically difficult. Untrained neural networks are employed as the reconstruction algorithm to enable robust reconstruction against stage motion errors caused by the in-plane rotation of samples. From demonstration experiments using full-field X-ray microscopy with advanced Kirkpatrick–Baez mirror optics at SPring-8, a spatial resolution of 34 nm (half period) was successfully achieved by removing the wavefront aberration and improving the apparent numerical aperture. This method can contribute to the cost-effective improvement of X-ray microscopes with imperfect lenses as well as the reconstruction of the phase information of samples and lenses.

DOI： 10.1038/s41598-024-79237-x

Propagation-based phase-contrast imaging method for full-field X-ray microscopy using advanced Kirkpatrick–Baez mirrors Reviewed Open Access

Yuto Tanaka, Jumpei Yamada, Takato Inoue, Takashi Kimura, Mari Shimura, Yoshiki Kohmura, Makina Yabashi, Tetsuya Ishikawa, Kazuto Yamauchi, Satoshi Matsuyama

Optics Express Vol. 31 ( 16 ) page： 26135 - 26144 2023.7

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

We demonstrate a propagation-based phase-contrast imaging method for full-field X-ray microscopy based on advanced Kirkpatrick–Baez (AKB) mirrors to achieve high-contrast observations of weak phase objects and correct field curvature aberrations. Through a demonstration performed at SPring-8, the phase contrast of weak phase objects such as polystyrene spheres and chemically fixed cells was successfully observed with high sensitivity (∼0.03 rad). Furthermore, the field of view of the AKB mirrors was expanded to the full area of the obtained images (25 × 30 µm) by correcting the field curvature aberration using reconstructed complex wavefields.

DOI： 10.1364/OE.493789

Other Link： https://opg.optica.org/viewmedia.cfm?URI=oe-31-16-26135&seq=0

Generation of an X-ray nanobeam of free electron laser using reflective optics with speckle interferometry Reviewed

T. Inoue, S. Matsuyama, J. Yamada, N. Nakamura, T. Osaka, I. Inoue, Y. Inubushi, K. Tono, H. Yumoto, T. Koyama, H. Ohashi, M. Yabashi, T. Ishikawa, K. Yamauchi

Journal of Synchrotron Radiation Vol. 27 ( 4 ) page： 883 - 889 2020.7

Language：English Publishing type：Research paper (scientific journal) Publisher：INT UNION CRYSTALLOGRAPHY

Ultimate focusing of an X-ray free-electron laser (XFEL) enables the generation of ultrahigh-intensity X-ray pulses. Although sub-10 nm focusing has already been achieved using synchrotron light sources, the sub-10 nm focusing of XFEL beams remains difficult mainly because the insufficient stability of the light source hinders the evaluation of a focused beam profile. This problem is specifically disadvantageous for the Kirkpatrick-Baez (KB) mirror focusing system, in which a slight misalignment of similar to 300 nrad can degrade the focused beam. In this work, an X-ray nanobeam of a free-electron laser was generated using reflective KB focusing optics combined with speckle interferometry. The speckle profiles generated by 2 nm platinum particles were systematically investigated on a single-shot basis by changing the alignment of the multilayer KB mirror system installed at the SPring-8 Angstrom Compact Free-Electron Laser, in combination with computer simulations. It was verified that the KB mirror alignments were optimized with the required accuracy, and a focused vertical beam of 5.8 nm (+/- 1.2 nm) was achieved after optimization. The speckle interferometry reported in this study is expected to be an effective tool for optimizing the alignment of nano-focusing systems and for generating an unprecedented intensity of up to 10(22) W cm(-2) using XFEL sources.

DOI： 10.1107/S1600577520006980

Web of Science

PubMed

Full-field X-ray fluorescence microscope based on total-reflection advanced Kirkpatrick-Baez mirror optics Reviewed

S. Matsuyama, J. Yamada, Y. Kohmura, M. Yambashi, T. Ishikawa, K. Yamauchi

Optics Express Vol. 27 ( 13 ) page： 18318 - 18328 2019.6

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

A novel full-field X-ray fluorescence microscope based on total-reflection advanced Kirkpatrick–Baez mirror optics was developed. The total-reflection imaging mirror optics arrangement, with four reflections, has the advantage of being able to function both as a powerful low-pass energy filter, completely rejecting incident excitation X-rays, and as an achromatic optical imaging system. Isolated X-ray fluorescence signals can be imaged, avoiding imaging-detector saturation, with low background noise. A prototype fluorescence microscope constructed at SPring-8 demonstrated the capability to simultaneously image elemental distributions using various X-ray fluorescence signals (Ni, Cu, Zn, Ge, and Bi). A half-period spatial resolution of ~0.5–1 µm (1000–500 LP/mm) was achieved, owing to the achromaticity of the imaging mirrors and the photon-counting scheme of the CCD camera used for fluorescence detection.

DOI： 10.1364/OE.27.018318

Scopus

PubMed

Compact reflective imaging optics in hard X-ray region based on concave and convex mirrors Reviewed

J. Yamada, S. Matsuyama, Y. Sano, Y. Kohmura, M. Yabashi, T. Ishikawa, K. Yamauchi

Optics Express Vol. 27 ( 3 ) page： 3429 - 3438 2019.2

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

We demonstrated that the combination of a hyperbolic convex and elliptical concave mirrors works as a compact reflective X-ray imaging system with a short optical focal length and large magnification factor. We performed an experiment to form a one-dimensional demagnified image with a demagnification factor of 321 within an approximately 2-m-long optical setup at an X-ray energy of 10 keV. The results showed that this imaging optics system is capable of providing a resolution of ~40 nm. From wavefront analysis, it was confirmed that the optics possessed a wide field-of-view with a significant reduction of comatic aberration.

DOI： 10.1364/oe.27.003429

Scopus

PubMed

Nanofocusing of X-ray free-electron laser using wavefront-corrected multilayer focusing mirrors Reviewed

S. Matsuyama, T. Inoue, J. Yamada, J. Kim, H. Yumoto, Y. Inubushi, T. Osaka, I. Inoue, T. Koyama, K. Tono, H. Ohashi, M. Yabashi, T. Ishikawa, K. Yamauchi

Scientific Reports Vol. 8 2018.11

Language：English Publishing type：Research paper (scientific journal) Publisher：NATURE PUBLISHING GROUP

A method of fabricating multilayer focusing mirrors that can focus X-rays down to 10 nm or less was established in this study. The wavefront aberration induced by multilayer Kirkpatrick-Baez mirror optics was measured using a single grating interferometer at a photon energy of 9.1 keV at SPring-8 Angstrom Compact Free Electron Laser (SACLA), and the mirror shape was then directly corrected by employing a differential deposition method. The accuracies of these processes were carefully investigated, considering the accuracy required for diffraction-limited focusing. The wavefront produced by the corrected multilayer focusing mirrors was characterized again in the same manner, revealing that the root mean square of the wavefront aberration was improved from 2.7 (3.3) rad to 0.52 (0.82) rad in the vertical (horizontal) direction. A wave-optical simulator indicated that these wavefront-corrected multilayer focusing mirrors are capable of achieving sub-10-nm X-ray focusing.

DOI： 10.1038/s41598-018-35611-0

Web of Science

アダプティブX線顕微鏡における形状可変ミラーの形状最適化手法の提案

長嶋友作, 青戸仁志, 井上陽登, 松山智至

精密工学会学術講演会講演論文集 Vol. 2024A ( 0 ) page： 614 - 614 2024.8

Authorship：Last author Language：Japanese Publishing type：Research paper (other academic) Publisher：公益社団法人精密工学会

ミラーを用いた結像型X線顕微鏡は，高効率かつ色収差無くX線像を取得できる．更なる高分解能化にむけて，形状可変ミラーを用いたアダプティブ顕微鏡を開発しているが，顕微鏡の光学収差を計測することは困難である．この問題を解決するために，深層学習に基づき，顕微鏡像から，形状可変ミラーの変形形状を最適化できる手法を開発した．

DOI： 10.11522/pscjspe.2024a.0_614

CiNii Research

高空間周波数形状制御実現のための接合型形状可変ミラーの開発

加納愛彩, 井上陽登, 吉水純弥, 上山冬馬, 松山智至

精密工学会学術講演会講演論文集 Vol. 2024A ( 0 ) page： 610 - 610 2024.8

Authorship：Last author Language：Japanese Publishing type：Research paper (other academic) Publisher：公益社団法人精密工学会

X線ミラーを用いた結像型X線顕微鏡は優れた性能を有しており、更なる高空間分解能化が期待されている。一方で、高空間分解能化を実現するには，ミラーに求められる形状精度が厳しく，特に高い空間周波数の形状誤差への対応が難しい。この課題を解決するために、我々は3枚のニオブ酸リチウム（LN）を接合した形状可変ミラーを開発した。本発表では、作製したミラーの性能評価を行った結果を報告する。

DOI： 10.11522/pscjspe.2024a.0_610

CiNii Research

多層膜形状可変ミラーを用いたアダプティブX線顕微鏡の開発

南澤亮太, 井上陽登, 中林荘太, 加納愛彩, 吉水純弥, 香村芳樹, 矢橋牧名, 松山智至

精密工学会学術講演会講演論文集 Vol. 2024A ( 0 ) page： 613 - 613 2024.8

Authorship：Last author Language：Japanese Publishing type：Research paper (other academic) Publisher：公益社団法人精密工学会

Ｘ線顕微鏡の更なる高分解能化のためには，形状可変ミラーを用いたアダプティブ顕微鏡の構築が有力である．これまでにニオブ酸リチウム製の形状可変ミラーを開発し，アダプティブＸ線顕微鏡の原理実証に成功してきた．現在，分解能sub-10nmの達成を目指し新規光学系を開発している．本発表では，光学系の詳細や新規作製した形状可変ミラーの性能評価結果について報告する．

DOI： 10.11522/pscjspe.2024a.0_613

CiNii Research

Examination of measurement by hard X-ray grazing incidence diffraction patterns of isolated lattices for 3D 1-nm resolution Reviewed

Tetsuya Hoshino, Sadao Aoki, Masahide Itoh, Hiroshi Itoh, Takato Inoue, and Satoshi Matsuyama

Optical Engineering Vol. 63 ( 11 ) page： 111804-1 - 111804-11 2024.6

Role of sulfane sulfur species in elemental tellurium nanorod formation in mammalian cells

Yu-ki Tanaka, Hiroki Yanagi, Ayako Shiokawa, Akihiro Matsunaga, Mari Shimura, Satoshi Matsuyama, Yasunori Fukumoto, Noriyuki Suzuki, Yasumitsu Ogra

Redox Biochemistry and Chemistry Vol. 8 page： 100029-1 - 100029-8 2024.5

A lipid index for risk of hyperlipidemia caused by anti-retroviral drugs Reviewed Open Access

Mari Shimura, Nobuyo Higashi-Kuwata, Asuka Fujiwara, Mai Taniguchi, Takayuki Ichinose, Fumie Hamano, Masaaki Uematsu, Takato Inoue, Satoshi Matsuyama, Takahiro Suzuki, Arun K. Ghosh, Hideo Shindou, Takao Shimuzu, Hiroaki Mitsuya

Antiviral Research Vol. 223 page： 105819 2024.3

大視野を持つＸ線斜入射結像光学系を備えたX線顕微鏡

入山陽仁, 井上陽登, 松山智至

精密工学会学術講演会講演論文集 Vol. 2024S ( 0 ) page： 418 - 418 2024.2

Authorship：Last author Language：Japanese Publisher：公益社団法人精密工学会

全反射現象を用いたAdvanced Kirkpatrick-Baez (AKB）ミラー結像光学系は回折、屈折結像光学系と比較し高い結像効率と色収差がほとんどない利点を持つ。しかしこれまで開発されたWolterⅠ型およびⅢ型AKBミラー光学系は像面湾曲収差とコマ収差により視野が大きく制限されていた。我々はこれら2つの収差の低減を目的とし、WolterⅠ型ミラーに像面湾曲補正光学系を組み合わせた大視野結像光学系を提案した。本発表では顕微鏡開発の状況を報告する。

DOI： 10.11522/pscjspe.2024s.0_418

CiNii Research

高強度レーザー集光光学系のための大口径形状可変ミラーの開発

金﨑健太, 井上陽登, 吉水純弥, 中林荘太, 我妻一博, 石井雅樹, 松尾一輝, 松山智至

精密工学会学術講演会講演論文集 Vol. 2024S ( 0 ) page： 372 - 372 2024.2

Authorship：Last author Language：Japanese Publishing type：Research paper (other academic) Publisher：公益社団法人精密工学会

レーザー核融合は次世代エネルギー源として注目されている．しかし，核融合の過程におけるレーザー集光装置の劣化が必至であるため，長期的な運用が困難である．この課題を解決するために，集光装置に形状可変ミラーを導入し，補償光学システムを構築することが提案されている．本発表では，大口径かつ高温環境耐性のある単結晶圧電素子製形状可変ミラーの開発について報告する．

DOI： 10.11522/pscjspe.2024s.0_372

CiNii Research

色収差の無いX線 sub-10 nm 集光のための極薄形状可変ミラーの開発

上山冬馬, 井上陽登, 吉水純弥, 松山智至

精密工学会学術講演会講演論文集 Vol. 2024S ( 0 ) page： 427 - 427 2024.2

Authorship：Last author Language：Japanese Publisher：公益社団法人精密工学会

X線を色収差無く 10nm 集光するためには，全反射ミラーのみで大開口数化を実現しなければならない．この問題を解決するために，多数の薄板ミラーを並べた新規光学配置を考案している．この光学系を実現する最も重要な課題は，高い形状精度を有する薄板ミラーを作製することにある．そこで本研究では，圧電素子を用いた厚み 100µm 以下の形状可変ミラーを開発した．

DOI： 10.11522/pscjspe.2024s.0_427

CiNii Research

深層強化学習によるX線アダプティブミラー制御法の開発

長嶋友作, 青戸仁志, 井上陽登, 松山智至

精密工学会学術講演会講演論文集 Vol. 2024S ( 0 ) page： 421 - 421 2024.2

Authorship：Last author Language：Japanese Publishing type：Research paper (other academic) Publisher：公益社団法人精密工学会

ミラーを用いた結像型X線顕微鏡は，高効率かつ色収差無くX線像を取得できる．更なる高分解能化にむけて，形状可変ミラーを用いたアダプティブ顕微鏡を開発しているが，顕微鏡の光学収差を計測することは困難である．この問題を解決するために，深層強化学習に基づき，顕微鏡像の変化から，形状可変ミラーの変形形状を最適化できる手法を開発した．

DOI： 10.11522/pscjspe.2024s.0_421

CiNii Research

Development of precision Wolter mirrors for future soft x-ray observations of the Sun

Taro Sakao, Sota Kashima, Satoshi Matsuyama, Takato Inoue, Haruhito Iriyama, Shinnosuke Kurimoto, Kazuto Yamauchi, Yoshiki Kohmura, Akira Miyake, Hiroki Nakamori, Shunichiro Matsuzaka, Toshiki Taniguchi, Toshio Nakano, Noriyuki Narukage

Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray Vol. 13093 page： 191 - 191 2024

Ultimate condensation of hard X-ray free-electron laser reaching single-nanometre focus size and 1022 W/cm2 intensity

2023.10

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<松山 智至>

Papers - 松山 智至

<松山　智至>

Papers - 松山　智至