Tunable caustic phenomena in electron wavefields

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

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


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
StatePublished - Oct 1 2015


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

ASJC Scopus subject areas

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


Dive into the research topics of 'Tunable caustic phenomena in electron wavefields'. Together they form a unique fingerprint.

Cite this