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Holographically aided iterative phase retrieval.

S Flewett1, C M Günther, C von Korff Schmising

  • 1Institut für Optik und Atomare Physik, Technische Universität Berlin, Strasse des 17 Juni 135, 10623 Berlin,Germany. samuel.flewett@psi.ch

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Fourier transform holography (FTH) achieves nanometer resolution X-ray imaging. This study omits the need for large sample-detector distances in FTH, enhancing photon efficiency and preventing phase retrieval issues.

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Area of Science:

  • X-ray imaging
  • Holography
  • Materials science

Background:

  • Fourier transform holography (FTH) offers noise-resistant, nanometer-resolution X-ray imaging.
  • FTH typically requires significant distance between sample and reference for spatial separation.
  • Phase information is crucial for reconstructing images in FTH.

Purpose of the Study:

  • To demonstrate an optimized FTH method reducing the required sample-detector distance.
  • To enhance photon efficiency in FTH by enabling smaller illumination areas.
  • To mitigate non-uniqueness issues in iterative phase retrieval using a reference object.

Main Methods:

  • Iterative separation of the reconstruction and its autocorrelation.
  • Utilizing a small reference scattering object for phase information.
  • Applying magnetic circular dichroism (MCD) for magnetic domain imaging.

Main Results:

  • The requirement for large sample-detector distances in FTH was successfully omitted.
  • Increased photon efficiency was achieved due to a smaller illumination area.
  • The reference object prevented non-uniqueness problems common in iterative phase retrieval.

Conclusions:

  • The optimized FTH method allows for efficient nanometer-scale imaging without large spatial separation.
  • This technique enhances X-ray imaging capabilities for materials science applications.
  • The study successfully imaged magnetic domains in a cobalt/platinum multilayer using MCD at the cobalt L₃-edge.