A tunable path-separated electron interferometer with an amplitude-dividing grating beamsplitter
- Univ. of Oregon, Eugene, OR (United States); Hitachi Ltd., Hatoyama (Japan)
- RIKEN Center for Emergent Matter Science (CEMS), Hatoyama (Japan)
- RIKEN Center for Emergent Matter Science (CEMS), Hatoyama (Japan); Tohoku Univ., Sendai (Japan)
- Hitachi Ltd., Hatoyama (Japan)
- 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
Web of Science
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