Tunable caustic phenomena in electron wavefields

Amir Hossein Tavabi, Vadim Migunov, Christian Dwyer, Rafal E. Dunin-Borkowski, Giulio Pozzi

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Novel caustic phenomena, which contain fold, butterfly and elliptic umbilic catastrophes, are observed in defocused images of two approximately collinear oppositely biased metallic tips in a transmission electron microscope. The observed patterns depend sensitively on defocus, on the applied voltage between the tips and on their separation and lateral offset. Their main features are interpreted on the basis of a projected electrostatic potential model for the electron-optical phase shift.

Original languageEnglish (US)
Pages (from-to)57-64
Number of pages8
JournalUltramicroscopy
Volume157
DOIs
StatePublished - Oct 1 2015
Externally publishedYes

Keywords

  • Caustics
  • Electron optics
  • Shaped electron beams
  • Transmission electron microscopy

ASJC Scopus subject areas

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

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  • Cite this

    Tavabi, A. H., Migunov, V., Dwyer, C., Dunin-Borkowski, R. E., & Pozzi, G. (2015). Tunable caustic phenomena in electron wavefields. Ultramicroscopy, 157, 57-64. https://doi.org/10.1016/j.ultramic.2015.04.003