Quantitative evaluation of temporal partial coherence using 3D Fourier transforms of through-focus TEM images

Koji Kimoto, Hidetaka Sawada, Takeo Sasaki, Yuta Sato, Takuro Nagai, Megumi Ohwada, Kazu Suenaga, Kazuo Ishizuka

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We evaluate the temporal partial coherence of transmission electron microscopy (TEM) using the three-dimensional (3D) Fourier transform (FT) of through-focus images. Young's fringe method often indicates the unexpected high-frequency information due to non-linear imaging terms. We have already used the 3D FT of axial (non-tilted) through-focus images to reduce the effect of non-linear terms on the linear imaging term, and demonstrated the improvement of monochromated lower-voltage TEM performance [Kimoto et al., Ultramicroscopy 121 (2012) 31-39]. Here we apply the 3D FT method with intentionally tilted incidence to normalize various factors associated with a TEM specimen and an imaging device. The temporal partial coherence of two microscopes operated at 30, 60 and 80. kV is evaluated. Our method is applicable to such cases where the non-linear terms become more significant in lower acceleration voltage or aberration-corrected high spatial resolution TEM.

Original languageEnglish
Pages (from-to)86-93
Number of pages8
JournalUltramicroscopy
Volume134
DOIs
Publication statusPublished - 2013 Nov 1

Keywords

  • High-resolution transmission electron microscopy
  • Information limit
  • Spherical aberration corrector

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Instrumentation

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    Kimoto, K., Sawada, H., Sasaki, T., Sato, Y., Nagai, T., Ohwada, M., Suenaga, K., & Ishizuka, K. (2013). Quantitative evaluation of temporal partial coherence using 3D Fourier transforms of through-focus TEM images. Ultramicroscopy, 134, 86-93. https://doi.org/10.1016/j.ultramic.2013.06.008