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Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
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Ultrafast plasmonic rotors for electron beams.

Fatemeh Chahshouri1, Nahid Talebi1,2

  • 1Institute of Experimental and Applied Physics, Kiel University, 24098 Kiel, Germany.

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|June 11, 2025
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Summary
This summary is machine-generated.

Researchers created a rotating plasmonic near-field dipole to manipulate electron beams. The field

Keywords:
angular momentum transferelectron wavepacket shapinglocalized electromagnetic fieldsphoton-induced near-field electron microscopyplasmonic rotors

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Area of Science:

  • Plasmonics and ultrafast electron dynamics.
  • Quantum phenomena and electron wavefunction manipulation.

Background:

  • Interaction between free electrons and laser-induced near-fields is key for studying ultrafast processes.
  • Precise manipulation of electron wavefunctions is achievable via momentum transfer.

Purpose of the Study:

  • To generate and investigate a rotating plasmonic near-field dipole.
  • To study its interaction with a slow electron beam for momentum transfer and wavefunction control.

Main Methods:

  • Generated a rotating plasmonic near-field dipole using phase-offset orthogonally polarized laser pulses on a gold nanorod.
  • Investigated the interaction of this field with a slow electron beam.

Main Results:

  • The circulation direction of plasmonic fields significantly modulates electron dynamics, coupling strength, and recoil.
  • Synchronized interaction led to substantial angular momentum transfer to electron beams, deflecting wavepackets.
  • Demonstrated control over electron wavepacket trajectories.

Conclusions:

  • Plasmon rotors offer a novel method for shaping electron wavepackets.
  • Potential applications in ultrafast microscopy, spectroscopy, and quantum information processing.