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, Erfan Mafakheri, Robert W. Boyd, Stefano Frabboni; Highly efficient electron vortex beams generated by nanofabricated phase holograms. Appl. Phys. Lett. 27 January 2014; 104 (4): 043109. https://doi.org/10.1063/1.4863564
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