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Related Experiment Videos

Wet-etched diffractive lenses for hard X-rays.

C David1, E Ziegler, B Nöhammer

  • 1Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland. christian.david@psi.ch

Journal of Synchrotron Radiation
|August 7, 2001
PubMed
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Researchers developed a new method for fabricating X-ray Fresnel zone plates using electron-beam lithography and wet etching. These diffractive lenses achieve high aspect ratios and 20% diffraction efficiency for X-ray imaging applications.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • X-ray optics are crucial for advanced imaging and microscopy.
  • Fabricating high-resolution diffractive elements for X-rays presents significant challenges.

Purpose of the Study:

  • To present a novel fabrication method for linear transmission Fresnel zone plates (FZPs) for X-ray applications.
  • To achieve high aspect ratio diffractive structures suitable for the 8-15 keV photon energy range.

Main Methods:

  • Utilized electron-beam lithography for precise patterning.
  • Employed chemical wet etching on (110)-oriented silicon membrane substrates.
  • Fabricated diffractive structures with feature sizes down to 300 nm.

Main Results:

Related Experiment Videos

  • Achieved diffractive structures with aspect ratios exceeding 30.
  • Measured a diffraction efficiency of 20% for a fabricated lens using 13.3 keV radiation.
  • Demonstrated the feasibility of producing high-aspect-ratio FZPs for X-ray applications.

Conclusions:

  • The presented method enables the fabrication of high-performance X-ray Fresnel zone plates.
  • The achieved aspect ratios and diffraction efficiency are promising for advanced X-ray optics.
  • This technique offers a viable route for producing next-generation X-ray diffractive lenses.