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.
Highly efficient electron vortex beams generated by nanofabricated phase holograms / Vincenzo, Grillo; Gian Carlo, Gazzadi; Ebrahim, Karimi; Mafakheribashmagh, Erfan; Robert W., Boyd; Frabboni, Stefano. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - STAMPA. - 104:(2014), pp. 043109-1-043109-4. [10.1063/1.4863564]
Highly efficient electron vortex beams generated by nanofabricated phase holograms
MAFAKHERIBASHMAGH, ERFAN;FRABBONI, Stefano
2014
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.
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