A tunable path-separated electron interferometer with an amplitude-dividing grating beamsplitter

Fehmi S. Yasin, Ken Harada, Daisuke Shindo, Hiroyuki Shinada, Benjamin J. McMorran, Toshiaki Tanigaki

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Abstract

We demonstrate a tunable path-separated electron interferometer using a single amplitude-dividing beamsplitter to prepare multiple spatially isolated, coherent electron probe beams. We place four electrostatic bi-prisms in the optical column of a scanning transmission electron microscope (STEM) to achieve path separations of up to 25 μm, the largest demonstrated within amplitude-division electron interferometers while maintaining fringe visibility of the directly observed interference fringes at the detector. We characterize the fringe visibility of this setup over a range of path separations and perform STEM holography to reconstruct the full object wave of a fabricated Si ramp test phase object. We report a quantitative object-wave measurement in this configuration and confirm with an independent off-axis electron holography measurement. This experimental design can potentially be applied to high-resolution phase imaging and fundamental physics experiments, such as an exploration of the electron wave packet coherence length and the Aharonov-Bohm effect.

Original languageEnglish
Article number233102
JournalApplied Physics Letters
Volume113
Issue number23
DOIs
Publication statusPublished - 2018 Dec 3

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Yasin, F. S., Harada, K., Shindo, D., Shinada, H., McMorran, B. J., & Tanigaki, T. (2018). A tunable path-separated electron interferometer with an amplitude-dividing grating beamsplitter. Applied Physics Letters, 113(23), [233102]. https://doi.org/10.1063/1.5051380