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RIKEN SPring-8 Center

SR Imaging Instrumentation Team

Team Leader: Yoshiki Kohmura (D.Sci.)
Yoshiki  Kohmura(D.Sci.)

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 Field

Mathematical and physical sciences

Related Research Fields

Interdisciplinary science and 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. 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)
  2. 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).
  3. 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).
  4. 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)
  5. 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)
  6. 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)
  7. 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)
  8. 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)
  9. Kohmura, Y., Nishino, Y., Ishikawa, T., Miao, J.:
    "Effect of Distorted Illumination Waves on Coherent Diffraction Microscopy."
    Journal of Applied Physics 98,123105-1-123105-6 (2005)

Lab Members

Principal Investigator

Yoshiki Kohmura
Team Leader

Core Members

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

Contact Information

1-1-1 Kouto, Sayo-cho
Sayo-gun, Hyogo
679-5148 Japan

Email: kohmura [at]

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