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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Published on: July 5, 2016

Phase-shifting electron holography for atomic image reconstruction.

Kazuo Yamamoto1, Yoshihiro Sugawara, Martha R McCartney

  • 1Nanostructures Research Laboratory, Japan Fine Ceramics Center, Atsuta-ku, Nagoya, Japan. k-yamamoto@jfcc.or.jp

Journal of Electron Microscopy
|June 15, 2010
PubMed
Summary
This summary is machine-generated.

Phase-shifting electron holography precisely measured mercury cadmium telluride (HgCdTe) crystal structure. Uniform interference fringes minimized errors, enabling atomic-scale wave reconstruction and crystal polarity determination.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electron Microscopy

Background:

  • Precise measurement of high-spatial-frequency specimens is crucial for understanding material properties.
  • Phase-shifting electron holography offers potential for atomic-scale imaging but is sensitive to experimental artifacts.

Purpose of the Study:

  • To investigate the requirements for precise phase-shifting electron holography measurements.
  • To reconstruct the object-wave function of mercury cadmium telluride (HgCdTe) specimens.
  • To determine crystal polarity in HgCdTe.

Main Methods:

  • Phase-shifting electron holography was employed.
  • Fresnel fringes from the electrostatic biprism were identified as a source of error.
  • Biprism voltage was adjusted to achieve uniform interference fringes, minimizing reconstruction errors.
  • High-resolution holograms of HgCdTe single crystals were recorded.

Main Results:

  • Calculation errors due to Fresnel fringes were significantly reduced by optimizing biprism voltage.
  • High-visibility (65%) coarse interference fringes were obtained.
  • Atomic-scale object waves were reconstructed.
  • Despite lower microscope resolution than atomic column separation, crystal polarity was successfully determined.

Conclusions:

  • Optimizing interference fringe uniformity is critical for accurate phase-shifting electron holography.
  • This technique, even with sub-optimal microscope resolution, can provide valuable crystallographic information like polarity in HgCdTe.