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Miniaturized beamsplitters realized by X-ray waveguides.

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

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Summary

Researchers fabricated X-ray waveguide beamsplitters using advanced lithography. These devices efficiently split synchrotron X-ray beams, enabling precise control and interference pattern analysis, revealing phase vortices.

Keywords:
X-ray interferometryX-ray waveguidescoherencecoherent imagingphase retrieval

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Area of Science:

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

Background:

  • X-ray optics require precise beam manipulation.
  • Waveguide devices offer a path for controlling X-ray propagation.

Purpose of the Study:

  • To fabricate and characterize novel X-ray waveguide beamsplitters.
  • To investigate the interference of split X-ray beams and analyze near-field properties.

Main Methods:

  • Electron-beam lithography, reactive ion etching, and wafer bonding for waveguide fabrication.
  • Synchrotron X-ray source for beam coupling and characterization.
  • Phase retrieval algorithms and numerical propagation for field reconstruction and analysis.

Main Results:

  • Efficient coupling of focused synchrotron beams into air-filled waveguide channels with silicon cladding.
  • Tunable separation of the split beams at the waveguide exit.
  • Reconstruction of the near-field from the far-field interference pattern with high reliability.
  • Observation and analysis of phase vortices in the interfering beams.

Conclusions:

  • X-ray waveguide beamsplitters are successfully fabricated and characterized.
  • The developed method allows for controlled splitting and interference of X-ray beams.
  • Phase retrieval is a reliable tool for analyzing X-ray waveguide performance, revealing complex phenomena like phase vortices.