Observation of the Larmor and Gouy Rotations with Electron Vortex Beams
- 25 February 2013
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 110 (9), 093601
- https://doi.org/10.1103/physrevlett.110.093601
Abstract
Electron vortex beams carrying intrinsic orbital angular momentum (OAM) are produced in electron microscopes where they are controlled and focused by using magnetic lenses. We observe various rotational phenomena arising from the interaction between the OAM and magnetic lenses. First, the Zeeman coupling, proportional to the OAM and magnetic field strength, produces an OAM-independent Larmor rotation of a mode superposition inside the lens. Second, when passing through the focal plane, the electron beam acquires an additional Gouy phase dependent on the absolute value of the OAM. This brings about the Gouy rotation of the superposition image proportional to the sign of the OAM. A combination of the Larmor and Gouy effects can result in the addition (or subtraction) of rotations, depending on the OAM sign. This behavior is unique to electron vortex beams and has no optical counterpart, as Larmor rotation occurs only for charged particles. Our experimental results are in agreement with recent theoretical predictions. DOI: http://dx.doi.org/10.1103/PhysRevLett.110.093601 © 2013 American Physical SocietyOther Versions
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