A Scanning 2-Grating Free Electron Mach-Zehnder Interferometer
- URL: http://arxiv.org/abs/2104.09992v1
- Date: Fri, 16 Apr 2021 16:49:16 GMT
- Title: A Scanning 2-Grating Free Electron Mach-Zehnder Interferometer
- Authors: Cameron W. Johnson, Amy E. Turner, and Benjamin J. McMorran
- Abstract summary: A symmetric binary phase grating and condenser lens system forms two spatially separated, focused probes.
The two paths interfere at a second grating, creating in constructive or destructive interference in output beams.
This interferometer has many notable features: positionable probe beams, large path separations relative to beam width, continuously tunable relative phase between paths.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We demonstrate a 2-grating free electron Mach-Zehnder interferometer
constructed in a transmission electron microscope. A symmetric binary phase
grating and condenser lens system forms two spatially separated, focused probes
at the sample which can be scanned while maintaining alignment. The two paths
interfere at a second grating, creating in constructive or destructive
interference in output beams. This interferometer has many notable features:
positionable probe beams, large path separations relative to beam width,
continuously tunable relative phase between paths, and real-time phase
information. Here we use the electron interferometer to measure the relative
phase shifts imparted to the electron probes by electrostatic potentials as
well as a demonstration of quantitative nanoscale phase imaging of a
polystyrene latex nanoparticle.
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