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Water window ptychographic imaging with characterized coherent X-rays.

Max Rose1, Petr Skopintsev1, Dmitry Dzhigaev1

  • 1Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany.

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|May 2, 2015
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Summary

This study demonstrates soft X-ray ptychography for high-resolution imaging. The technique achieved 53 nm resolution on a test sample and sub-90 nm on a diatom, showcasing its potential for nanoscale imaging.

Keywords:
diatomnon-redundant arrayptychographywater window imaging

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Area of Science:

  • Coherent Diffractive Imaging
  • Soft X-ray Microscopy
  • Nanoscale Imaging

Background:

  • Ptychography is a powerful lensless imaging technique.
  • Soft X-rays offer unique contrast for biological and material samples.
  • Achieving high resolution in the water window requires a highly coherent X-ray beam.

Purpose of the Study:

  • To report on a ptychographical coherent diffractive imaging experiment in the water window.
  • To demonstrate high-resolution imaging using focused soft X-rays.
  • To characterize the coherence properties of the X-ray beam used.

Main Methods:

  • Utilized a highly coherent soft X-ray beam (500 eV) at the P04 beamline of PETRA III.
  • Employed the non-redundant array method to measure beam coherence.
  • Used a pinhole to select the coherent portion of the beam for ptychography.

Main Results:

  • Determined a coherence length of 4.1 µm and a global degree of coherence of 35%.
  • Achieved a resolution of 53 nm on a lithographically manufactured test sample.
  • Obtained a resolution better than 90 nm when imaging a fossil diatom.

Conclusions:

  • Soft X-ray ptychography enables high-resolution nanoscale imaging.
  • The characterized beam coherence is suitable for advanced imaging applications.
  • This technique shows promise for imaging delicate biological and nanostructured samples.