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@ARTICLE{Schachinger:893831,
      author       = {Schachinger, T. and Hartel, P. and Lu, P.-H. and Löffler,
                      S. and Obermair, M. and Dries, M. and Gerthsen, D. and
                      Dunin-Borkowski, R. E. and Schattschneider, P.},
      title        = {{E}xperimental realisation of a π /2 vortex mode converter
                      for electrons using a spherical aberration corrector},
      journal      = {Ultramicroscopy},
      volume       = {229},
      issn         = {0304-3991},
      address      = {Amsterdam},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2021-02870},
      pages        = {113340},
      year         = {2021},
      abstract     = {In 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.},
      cin          = {ER-C-1},
      ddc          = {570},
      cid          = {I:(DE-Juel1)ER-C-1-20170209},
      pnm          = {5351 - Platform for Correlative, In Situ and Operando
                      Characterization (POF4-535) / 3D MAGiC - Three-dimensional
                      magnetization textures: Discovery and control on the
                      nanoscale (856538) / Q-SORT - QUANTUM SORTER (766970) /
                      ESTEEM3 - Enabling Science and Technology through European
                      Electron Microscopy (823717)},
      pid          = {G:(DE-HGF)POF4-5351 / G:(EU-Grant)856538 /
                      G:(EU-Grant)766970 / G:(EU-Grant)823717},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {34311124},
      UT           = {WOS:000692519200003},
      doi          = {10.1016/j.ultramic.2021.113340},
      url          = {https://juser.fz-juelich.de/record/893831},
}