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RIKEN SPring-8 Center SR Imaging Instrumentation Team

Team Leader: Yoshiki Kohmura (D.Sc.)

Research Summary

Yoshiki  Kohmura

The SR Imaging Instrumentation Team implements common equipment for use at undulator beamline BL29XUL at SPring-8, so that leading edge X-ray imaging techniques are further developed for the medical, biological, and materials science fields.
The team’s original techniques enable the control of X-rays using structured materials and the manipulation of materials using structured X-rays. (i) The team is studying the X-ray translation effect caused by the deformation of crystal lattices that they recently discovered. (ii) The team has successfully manipulated, trapped, and nano-fabricated materials using structured X-ray beams.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Interdisciplinary Science & Engineering
  • Science using Quantum Beam
  • Science using Quantum Beam
  • Nano/Micro Science


  • X-ray Optics
  • X-ray waveguide
  • X-ray Wave-front engineering
  • Nano-fabrication
  • Novel image contrast formation of X-ray microscope

Selected Publications

  • 1. Hoshino, T., Kohmura, Y., et al.
    "Dynamical heterogeneity near glass-transition temperature under shear conditions"
    Phys. Rev. Lett. (2020)
  • 2. Kohmura, Y., Zhakhovsky, V., Takei, D., Suzuki, et al.:
    "Nano-structuring of multi-layer material by single x-ray vortex pulse with femtosecond duration"
    Applied Physical Letters, 112, 123103 (2018)
  • 3.Takei, D., Kohmura, Y., Sawada, K., et al.:
    "Unidirectional X-ray Output from a Crystal Waveguide affected by Berry's Phase"
    Optics Express, 24(21) 24544-24550 (2016).
  • 4. Suzuki, A., Furutaku, S., Shimomura, K., Yamauchi, K., Kohmura, Y., Ishikawa, T., and Takahashi, Y.:
    "High-Resolution Multislice X-Ray Ptychography of Extended Thick Objects"
    Phys. Rev. Lett. 112, 053903 (2014).
  • 5. Kohmura, Y., Sawada, K., Fukatsu, S., Ishikawa, T.:
    "Controlling the Propagation of X-Ray Waves inside a Heteroepitaxial Crystal Containing Quantum Dots Using Berry's Phase."
    Phys. Rev. Lett. 110, 057402-1-057402-4 (2013)
  • 6. Kohmura, Y., Sawada, K., Ishikawa, T.:
    "Berry-Phase Translation of X Rays by a Deformed Crystal."
    Phys. Rev. Lett. 104, 244801-1-244801-4 (2010)
  • 7. Kohmura, Y., Sawada, K., Taguchi, M., Ishikawa, T., Ohigashi, T., Suzuki, Y.:
    "Formation of x-ray vortex dipoles using a single diffraction pattern and direct phase measurement using interferometry."
    Applied Physics Letters 94, 101112-1-101112-3 (2009)
  • 8. Kohmura, Y., Sakurai, T., Ishikawa, T., Takeuchi, A., Suzuki, Y., Goto, S.:
    "Determination of complex transmissivity using x-ray in-line holography and two-beam interferometry."
    Journal of Applied Physics 102, 023101-1-023101-5 (2007)
  • 9. Miao, J., Chen, C.C., Song, C., Nishino, Y., Kohmura, Y., Ishikawa, T., Ramunno-Johnson, D., Lee, T.K., Risbud, S.H.:
    "Three-Dimensional GaN-Ga2O3 Core Shell Structure Revealed by X-ray Diffraction Microscopy."
    Phys. Rev. Lett. 97, 215503-1-215503-4 (2006)

Recent Research Results

Lab Members

Principal investigator

Yoshiki Kohmura
Team Leader

Core members

Kenichi Kato
Senior Research Scientist
Hiroyuki Ohsumi
Senior Research Scientist
Taiki Hoshino
Senior Research Scientist


Position Deadline
Seeking a Research Scientist or Postdoctoral Researcher position (C21-0204) Open until filled

Contact Information

1-1-1 Kouto, Sayo-cho
Sayo-gun, Hyogo
679-5148 Japan
Email: kohmura [at] spring8.or.jp