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Related Experiment Video

Updated: Oct 9, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Integrated photonics enables continuous-beam electron phase modulation.

Jan-Wilke Henke1,2, Arslan Sajid Raja3, Armin Feist1,2

  • 1Georg-August-Universität Göttingen, Göttingen, Germany.

Nature
|December 23, 2021
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Summary
This summary is machine-generated.

This study merges integrated photonics with electron microscopy to precisely control electron beams using microresonators. This breakthrough enables efficient laser-based manipulation of free electrons for advanced quantum optics applications.

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Area of Science:

  • Quantum Optics
  • Integrated Photonics
  • Electron Microscopy

Background:

  • Integrated photonics offers precise control over light-matter interactions in quantum systems.
  • Ultrafast electron microscopy has advanced with laser-based quantum manipulation of free-electron beams.
  • Chip-based photonics has potential in nanoscale quantum control but is underexplored in electron microscopy.

Purpose of the Study:

  • To merge integrated photonics with electron microscopy for enhanced electron beam control.
  • To demonstrate coherent phase modulation of continuous electron beams using silicon nitride microresonators.
  • To establish a versatile platform for free-electron quantum optics.

Main Methods:

  • Utilized a high-finesse silicon nitride microresonator for electron-light interaction.
  • Employed phase-matched waveguides for efficient scattering.
  • Integrated fiber-coupled photonic structures for controlled optical input/output.

Main Results:

  • Achieved coherent phase modulation of a continuous electron beam at low continuous-wave optical powers (5.35 microwatts).
  • Generated over 500 electron energy sidebands with milliwatt optical power.
  • Probed unidirectional intracavity fields with microelectronvolt resolution using electron-energy-gain spectroscopy.

Conclusions:

  • This work establishes an efficient framework for advanced electron beam control in electron microscopy.
  • The developed platform enables applications in laser phase plates, attosecond pulse generation, and spectroscopy.
  • Paves the way for future research in strong coupling, quantum probing, and electron-photon entanglement.