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Nanosecond electron holography by interference gating.

Tolga Wagner1, Tore Niermann1, Felix Urban1

  • 1Technische Universität Berlin, Institut für Optik und Atomare Physik, Straße des 17. Juni 135, Berlin 10623, Germany.

Ultramicroscopy
|August 12, 2019
PubMed
Summary
This summary is machine-generated.

Interference gating enables robust time-resolved electron holography by controlling interference patterns. This novel method achieves 100 ns resolution, allowing observation of fast dynamic processes.

Keywords:
Condenser biprismElectrical biasingInterference gatingNanosecond time resolutionTime-resolved electron holography

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Area of Science:

  • Electron microscopy
  • Holography
  • Materials science

Background:

  • Time-resolved electron holography requires precise control over interference patterns.
  • Existing methods face limitations in temporal resolution for observing ultrafast phenomena.

Purpose of the Study:

  • To present a new interference gating arrangement for enhanced time-resolved electron holographic measurements.
  • To demonstrate the feasibility of achieving picosecond time resolution using this method.

Main Methods:

  • Utilizing a biprism in the condenser aperture as a fast electric phase shifter.
  • Applying high-frequency stimulation (gigahertz range) to the electric phase shifter.
  • Employing forward correction of the control signal to overcome bandwidth limitations.

Main Results:

  • Demonstrated interference gating in the upper picosecond range.
  • Achieved a time resolution of 100 nanoseconds.
  • Successfully measured the transient response of a biasing holder system.

Conclusions:

  • The developed interference gating method offers robust and high-resolution time-resolved electron holography.
  • This technique provides a pathway to investigate ultrafast dynamic processes with unprecedented temporal and spatial accuracy.