Reconstruction technique for off-axis electron holography using coarse fringes

Takeshi Fujita, Kazuo Yamamoto, Martha McCartney, David Smith

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

A reconstruction technique for off-axis electron holography not requiring Fourier transformation is presented. Background intensity and amplitude modulation recorded in a hologram are normalized using an envelope function, and a cosine-function image corresponding to interference fringes is retrieved from the hologram. A reconstructed phase image is then calculated from the retrieved cosine image. After phase unwrapping, the phases due to carrier frequency and Fresnel diffraction from the biprism are removed using a reference hologram, and the corrected phase image is obtained. One advantage of this method is that the spatial resolution does not rely on the interference fringe spacing. Another advantage is that the phase image has no artifacts due to windowing of the sideband, which occurs in the usual Fourier-transformation method. Details of the calculation process and demonstrations of the method using a latex sphere particle and self-assembled Co nanoparticles are described.

Original languageEnglish (US)
Pages (from-to)486-491
Number of pages6
JournalUltramicroscopy
Volume106
Issue number6
DOIs
Publication statusPublished - Apr 2006

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Keywords

  • Co nanoparticle
  • Electron holography
  • Image processing
  • Latex sphere
  • Phase retrieval

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation

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