Novel Vortex Generator and Mode Converter for Electron Beams
Novel Vortex Generator and Mode Converter for Electron Beams
A mode converter for electron vortex beams is described. Numerical simulations, confirmed by experiment, show that the converter transforms a vortex beam with a topological charge $m=\ifmmode\pm\else\textpm\fi{}1$ into beams closely resembling Hermite-Gaussian ${\mathrm{HG}}_{10}$ and ${\mathrm{HG}}_{01}$ modes. The converter can be used as a mode discriminator or filter for electron vortex …