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RESEARCH SUPPORT, NON-U.S. GOV'T
Production of electron vortex beams carrying large orbital angular momentum using spiral zone plates.
Journal of Electron Microscopy 2012 June
We report the production of electron vortex beams carrying large orbital angular momentum (OAM) using micro-fabricated spiral zone plates. A series of the spherical waves, focussing onto different positions along the propagating direction of the electron beam, were observed. The nth order vortex beam has an OAM n times larger than that of the first-order vortex beam. We observed an electron vortex with an OAM up to in a high-order diffracted wave. A linear dependence of the diameter of the vortex beam on the OAM was observed, being consistent to numerical simulations.
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