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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Profile etching for prefiguring X-ray mirrors.

Chian Liu1, Jun Qian1, Lahsen Assoufid1

  • 1X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.

Journal of Synchrotron Radiation
|February 28, 2015
PubMed
Summary
This summary is machine-generated.

This study presents a novel etching method for pre-shaping mirror substrates. This technique efficiently creates precise X-ray optics, offering a cost-effective solution for scientific instruments.

Keywords:
broad-beam ion figuringion etchingnested KB mirrorsprofile coating

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Surface Engineering

Background:

  • Advanced X-ray optics require precise surface shaping for optimal performance.
  • Traditional methods for fabricating aspheric mirrors can be complex and expensive.
  • The demand for cost-effective, high-precision optical components is growing in scientific research.

Purpose of the Study:

  • To introduce a new method for pre-shaping mirror substrates using ion beam etching.
  • To demonstrate the effectiveness of profile etching for creating elliptical cylinder substrates.
  • To present a combined approach of profile etching and coating for economical X-ray optic fabrication.

Main Methods:

  • Utilizing a broad-beam ion source and a contoured mask for etching.
  • Employing a single-step profile-etching process on a super-polished silicon substrate.
  • Applying a 600 V beam voltage for controlled material removal.
  • Combining profile etching with a subsequent profile coating step.

Main Results:

  • Successfully fabricated a 100 mm long elliptical cylinder substrate from a flat silicon substrate.
  • Achieved a figure error of 48 nm root-mean-square (r.m.s.) and a roughness of 1.5 Å r.m.s. in a single etching pass.
  • Demonstrated the feasibility of achieving a final mirror through a follow-up coating process.

Conclusions:

  • The presented profile etching method is an efficient and iterative-free technique for pre-shaping mirror substrates.
  • The combination of profile etching and coating offers an economical route to producing advanced X-ray optics.
  • This method is particularly suitable for fabricating complex optical systems like nested Kirkpatrick-Baez mirrors.