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

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5051380· OSTI ID:1611424
ORCiD logo [1];  [2];  [3];  [4];  [5];  [4]
  1. Univ. of Oregon, Eugene, OR (United States); Hitachi Ltd., Hatoyama (Japan)
  2. RIKEN Center for Emergent Matter Science (CEMS), Hatoyama (Japan)
  3. RIKEN Center for Emergent Matter Science (CEMS), Hatoyama (Japan); Tohoku Univ., Sendai (Japan)
  4. Hitachi Ltd., Hatoyama (Japan)
  5. Univ. of Oregon, Eugene, OR (United States)

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.

Research Organization:
Univ. of Oregon, Eugene, OR (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0010466; 1309047
OSTI ID:
1611424
Journal Information:
Applied Physics Letters, Vol. 113, Issue 23; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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