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000830517 0247_ $$2doi$$a10.1016/j.ultramic.2017.06.001
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000830517 1001_ $$0P:(DE-HGF)0$$aPozzi, Giulio$$b0$$eCorresponding author
000830517 245__ $$aGeneration of electron vortex beams using line charges via the electrostatic Aharonov-Bohm effect
000830517 260__ $$aAmsterdam$$bElsevier Science$$c2017
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000830517 520__ $$aIt has recently been shown that an electron vortex beam can be generated by the magnetic field surrounding the tip of a dipole-like magnet. This approach can be described using the magnetic Aharonov-Bohm effect and is associated with the fact that the end of a long magnetic rod can be treated approximately as a magnetic monopole. However, it is difficult to vary the magnetisation of the rod in such a setup and the electron beam vorticity is fixed for a given tip shape. Here, we show how a similar behaviour, which has the advantage of easy tuneability, can be achieved by making use of the electrostatic Aharonov-Bohm effect associated with an electrostatic dipole line. We highlight the analogies between the magnetic and electrostatic cases and use simulations of in-focus, Fresnel and Fraunhofer images to show that a device based on two parallel, oppositely charged lines that each have a constant charge density can be used to generate a tuneable electron vortex beam. We assess the effect of using a dipole line that has a finite length and show that if the charge densities on the two lines are different then an additional biprism-like effect is superimposed on the electron-optical phase.
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000830517 7001_ $$0P:(DE-HGF)0$$aLu, Peng-Han$$b1
000830517 7001_ $$0P:(DE-Juel1)157886$$aTavabi, Amir H.$$b2$$ufzj
000830517 7001_ $$0P:(DE-Juel1)145413$$aDuchamp, Martial$$b3
000830517 7001_ $$0P:(DE-Juel1)144121$$aDunin-Borkowski, Rafal$$b4$$ufzj
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