Practical procedure for retrieval of quantitative phase map for two-phase interface using the transport of intensity equation

Xiaobin Zhang, Yoshifumi Oshima

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

A practical procedure for retrieving quantitative phase distribution at the interface between a thin amorphous germanium (a-Ge) film and vacuum based on the transport of intensity equation is proposed. First, small regions were selected in transmission electron microscopy (TEM) images with three different focus settings in order to avoid phase modulation due to low frequency noise. Second, the selected TEM image and its three reflected images were combined for mirror-symmetry to meet the boundary requirements. However, in this symmetrization, extra phase modulation arose due to the discontinuous nature of Fresnel fringes at the boundaries among the four parts of the combined image. Third, a corrected phase map was obtained by subtracting a linear fit to the extra phase modulation. The phase shift for a thin a-Ge film was determined to be approximately 0.5. rad, indicating that the average inner potential was 18.3. V. The validity of the present phase retrieval is discussed using simple simulations.

Original languageEnglish
Pages (from-to)49-55
Number of pages7
JournalUltramicroscopy
Volume158
DOIs
Publication statusPublished - 2015 Nov 1

Keywords

  • Phase map
  • TEM
  • Transport of intensity equation

ASJC Scopus subject areas

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

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