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Waveguide-based off-axis holography with hard X rays.

C Fuhse1, C Ollinger, T Salditt

  • 1Institut für Röntgenphysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.

Physical Review Letters
|February 7, 2007
PubMed
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We demonstrate off-axis holography using X-ray waveguides, achieving 100 nm spatial resolution for sample imaging. Future experiments aim for 10 nm resolution with improved waveguide designs.

Area of Science:

  • Optics and Photonics
  • X-ray Imaging
  • Materials Science

Background:

  • X-ray microscopy offers high resolution but often lacks phase information.
  • Holography is a powerful technique for phase retrieval.
  • Waveguides can shape and focus coherent X-ray beams.

Purpose of the Study:

  • To develop an off-axis holography technique using X-ray waveguides.
  • To achieve high spatial resolution imaging of samples at 10.4 keV.
  • To explore the potential for nanoscale resolution with X-ray waveguides.

Main Methods:

  • Utilized coherent cone beams from a pair of X-ray waveguides for off-axis holography.
  • Recorded magnified off-axis holograms.
  • Performed digital holographic reconstruction to retrieve the phase of the sample's optical transmission function.

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Main Results:

  • Achieved a spatial resolution of approximately 100 nm at 10.4 keV photon energy.
  • Demonstrated that spatial resolution is dependent on the waveguide's cross-sectional dimensions.
  • Identified potential for future resolution improvements down to 10 nm.

Conclusions:

  • Off-axis holography with X-ray waveguides is a viable method for high-resolution phase imaging.
  • Waveguide design is critical for achieving ultimate spatial resolution limits.
  • A novel experimental setup is proposed to further enhance resolution beyond current capabilities.