Highly efficient electron vortex beams generated by nanofabricated phase holograms
Abstract
We propose an improved type of holographic-plate suitable for the shaping of electron beams. The plate is fabricated by a focused ion beam on a silicon nitride membrane and introduces a controllable phase shift to the electron wavefunction. We adopted the optimal blazed-profile design for the phase hologram, which results in the generation of highly efficient (25%) electron vortex beams. This approach paves the route towards applications in nano-scale imaging and materials science.
- Publication:
-
Applied Physics Letters
- Pub Date:
- January 2014
- DOI:
- 10.1063/1.4863564
- Bibcode:
- 2014ApPhL.104d3109G