Thursday, July 25, 2013

1307.6304 (Koh Saitoh et al.)

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

Koh Saitoh, Yuya Hasegawa, Kazuma Hirakawa, Nobuo Tanaka, Masaya Uchida
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.
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