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Related Experiment Videos

Soft-X-ray microscopy using spiral zone plates.

Anne Sakdinawat1, Yanwei Liu

  • 1University of California San Francisco and University of California Berkeley Joint Graduate Group in Bioengineering, University of California, Berkeley, CA 94720, USA. aesakdinawat@lbl.gov

Optics Letters
|September 18, 2007
PubMed
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Spiral zone plates (SZPs) enable phase-sensitive soft-x-ray microscopy by optically implementing the radial Hilbert transform. This method allows for isotropic measurement of amplitude and phase gradients in samples.

Area of Science:

  • Soft-x-ray microscopy
  • Phase contrast imaging
  • Optical physics

Background:

  • Phase effects are crucial for contrast in certain microscopy applications.
  • Traditional methods may not capture phase information isotropically.
  • Spiral zone plates (SZPs) offer a novel approach to phase detection.

Purpose of the Study:

  • To demonstrate soft-x-ray microscopy using SZPs as objective lenses.
  • To investigate the capability of SZPs in measuring amplitude and phase gradients.
  • To achieve isotropic edge enhancement for improved sample analysis.

Main Methods:

  • Fabrication of regular zone plates, charge 1 SZPs, and charge 2 SZPs using electron beam lithography.
  • Implementation of SZPs as single-element objective lenses in a soft-x-ray microscope.

Related Experiment Videos

  • Imaging of a 1 micrometer circular aperture at a wavelength of 2.73 nm (454 eV).

    • Main Results:

    • Successful demonstration of soft-x-ray microscopy with SZPs.
    • Observation of isotropic edge enhancement in images obtained with charge 1 and charge 2 SZPs.
    • Validation of radial Hilbert filtering for phase gradient measurement.

    Conclusions:

    • SZPs are effective for phase-sensitive soft-x-ray microscopy.
    • The radial Hilbert transform implemented with SZPs provides isotropic phase gradient information.
    • This technique enhances edge detection and phase contrast in soft-x-ray imaging.