title: 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 nℏ. 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.
authors.affiliation: EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan.
authors.forename: Koh
authors.initials: K
authors.lastname: Saitoh
authors.forename: Yuya
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: Kazuma
authors.initials: K
authors.lastname: Hirakawa
authors.forename: Nobuo
authors.initials: N
authors.lastname: Tanaka
authors.forename: Masaya
authors.initials: M
authors.lastname: Uchida