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

doi:10.1063/1.5051380

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

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

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 language	English
Article number	233102
Journal	Applied Physics Letters
Volume	113
Issue number	23
DOIs	https://doi.org/10.1063/1.5051380
Publication status	Published - 2018 Dec 3

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "A tunable path-separated electron interferometer with an amplitude-dividing grating beamsplitter",

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.",

author = "Yasin, {Fehmi S.} and Ken Harada and Daisuke Shindo and Hiroyuki Shinada and McMorran, {Benjamin J.} and Toshiaki Tanigaki",

note = "Funding Information: The authors wish to thank Jordan Pierce at the University of Oregon for FIB instrument support and instruction. We gratefully acknowledge the use of the RIKEN microscope located at Hitachi, Ltd. in Hatoyama, Japan. Grating fabrication was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award No. DE-SC0010466. F.S.Y. was supported under the National Science Foundation Graduate Research Fellowship Program under Grant No. 1309047 and is a JSPS International Research Fellow. Publisher Copyright: {\textcopyright} 2018 Author(s).",

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AU - Shinada, Hiroyuki

AU - McMorran, Benjamin J.

AU - Tanigaki, Toshiaki

N1 - Funding Information: The authors wish to thank Jordan Pierce at the University of Oregon for FIB instrument support and instruction. We gratefully acknowledge the use of the RIKEN microscope located at Hitachi, Ltd. in Hatoyama, Japan. Grating fabrication was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award No. DE-SC0010466. F.S.Y. was supported under the National Science Foundation Graduate Research Fellowship Program under Grant No. 1309047 and is a JSPS International Research Fellow. Publisher Copyright: © 2018 Author(s).

PY - 2018/12/3

Y1 - 2018/12/3

N2 - 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.

AB - 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.

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

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