Measuring the orbital angular momentum of electron vortex beams using a forked grating

Abstract

The present study experimentally examines how an electron vortex beam with orbital angular momentum (OAM) undergoes diffraction through a forked grating. The nth-order diffracted electron vortex beam after passing through a forked grating with a Burgers vector of 1 shows an OAM transfer of nh. Hence, the diffraction patterns become mirror asymmetric owing to the size difference between the electron beams. Such a forked grating, when used in combination with a pinhole located at the diffraction plane, could act as an analyzer to measure the OAM of input electrons.

5 pages, 3 figures

References in corpus (2)

• Quantised orbital angular momentum transfer and magnetic dichroism in the interaction of electron vortices with matter
• A new way of producing electron vortex probes for STEM

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