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 language | English (US) |
|---|---|
| Pages (from-to) | 57-64 |
| Number of pages | 8 |
| Journal | Ultramicroscopy |
| Volume | 157 |
| DOIs | |
| State | Published - Oct 1 2015 |
| Externally published | Yes |
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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
Cite this
Tunable caustic phenomena in electron wavefields. / Tavabi, Amir Hossein; Migunov, Vadim; Dwyer, Christian; Dunin-Borkowski, Rafal E.; Pozzi, Giulio.
In: Ultramicroscopy, Vol. 157, 01.10.2015, p. 57-64.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Tunable caustic phenomena in electron wavefields
AU - Tavabi, Amir Hossein
AU - Migunov, Vadim
AU - Dwyer, Christian
AU - Dunin-Borkowski, Rafal E.
AU - Pozzi, Giulio
PY - 2015/10/1
Y1 - 2015/10/1
N2 - 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.
AB - 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.
KW - Caustics
KW - Electron optics
KW - Shaped electron beams
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=84930959574&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84930959574&partnerID=8YFLogxK
U2 - 10.1016/j.ultramic.2015.04.003
DO - 10.1016/j.ultramic.2015.04.003
M3 - Article
AN - SCOPUS:84930959574
VL - 157
SP - 57
EP - 64
JO - Ultramicroscopy
JF - Ultramicroscopy
SN - 0304-3991
ER -