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Electron Acceleration by Relativistic Surface Plasmons in Laser-Grating Interaction.

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Area of Science:

  • Plasma physics
  • Laser-matter interaction
  • Surface plasmonics

Background:

  • Investigating energetic electron bunch generation is crucial for developing advanced light sources.
  • Understanding laser-plasma interactions at ultrahigh intensities informs novel acceleration techniques.

Purpose of the Study:

  • To investigate energetic electron bunch generation using ultraintense laser pulses on grating targets.
  • To explore the role of surface plasmons in laser-driven electron acceleration.

Main Methods:

  • Utilized short, ultraintense laser pulses (I>10^19 W/cm^2) with ultrahigh contrast (10^12) on grating targets.
  • Performed experiments at incidence angles near the resonant condition for surface plasmon excitation.
  • Employed three-dimensional particle-in-cell simulations to model the interaction and electron acceleration.

Main Results:

  • Observed strong electron emission in a narrow cone along the target surface, with energies peaking at 5-8 MeV and total charge ~100 pC.
  • Demonstrated significant enhancement in both energy and number of emitted electrons compared to flat targets.
  • Simulations confirmed the generation of relativistic surface plasmons driving the acceleration process.

Conclusions:

  • Grating targets significantly enhance laser-driven electron bunch generation via surface plasmon excitation.
  • This scheme offers a promising pathway for compact, ultrashort sources of MeV electrons.
  • The findings advance the field of high-field plasmonics and laser-driven particle acceleration.