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000893831 1001_ $$00000-0003-2307-9092$$aSchachinger, T.$$b0$$eCorresponding author
000893831 245__ $$aExperimental realisation of a π /2 vortex mode converter for electrons using a spherical aberration corrector
000893831 260__ $$aAmsterdam$$bElsevier Science$$c2021
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000893831 520__ $$aIn light optics, beams with orbital angular momentum (OAM) can be produced by employing a properly-tuned two-cylinder-lens arrangement, also called /2 mode converter. It is not possible to convey this concept directly to the beam in an electron microscope due to the non-existence of cylinder lenses in commercial transmission electron microscopes (TEMs). A viable work-around are readily-available electron optical elements in the form of quadrupole lenses. In a proof-of-principle experiment in 2012, it has been shown that a single quadrupole in combination with a Hilbert phase-plate produces a spatially-confined, transient vortex mode.Here, an analogue to an optical /2 mode converter is realized by repurposing a CEOS DCOR probe corrector in an aberration corrected TEM in a way that it resembles a dual cylinder lens using two quadrupoles. In order to verify the presence of OAM in the output beam, a fork dislocation grating is used as an OAM analyser. The possibility to use magnetic quadrupole fields instead of, e.g., prefabricated fork dislocation gratings to produce electron beams carrying OAM enhances the beam brightness by almost an order of magnitude and delivers switchable high-mode purity vortex beams without unwanted side-bands.
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000893831 536__ $$0G:(EU-Grant)823717$$aESTEEM3 - Enabling Science and Technology through European Electron Microscopy (823717)$$c823717$$fH2020-INFRAIA-2018-1$$x3
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000893831 7001_ $$0P:(DE-HGF)0$$aHartel, P.$$b1
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000893831 7001_ $$0P:(DE-HGF)0$$aLöffler, S.$$b3
000893831 7001_ $$0P:(DE-HGF)0$$aObermair, M.$$b4
000893831 7001_ $$0P:(DE-HGF)0$$aDries, M.$$b5
000893831 7001_ $$0P:(DE-HGF)0$$aGerthsen, D.$$b6
000893831 7001_ $$0P:(DE-Juel1)144121$$aDunin-Borkowski, R. E.$$b7$$ufzj
000893831 7001_ $$0P:(DE-HGF)0$$aSchattschneider, P.$$b8
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