FIB cleaned an reshaped Electrostatic Electron Vortex Beam Generators

Here are collected the SEM images (top-view and tilted-view) of the Electrostatic Electron Vortex Beam Generators fabricated at the CNR-IMM in Bologna and then cleaned and reshaped by FIB milling at the CNR-NANO in Modena. Different shapes of the main paired needles have been fabricated to try to optimize the reproduction the ideal phase profile as reported in https://doi.org/10.1103/PhysRevResearch.2.013185