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Sub-cycle dynamics in relativistic nanoplasma acceleration.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Light interaction with nanostructures enables sub-wavelength focusing and electric field enhancement.
  • Nanoplasmas offer unique collective effects for light-matter interactions.

Purpose of the Study:

  • To extend waveform-dependent electron acceleration into the relativistic regime.
  • To achieve controlled acceleration of multi-MeV electron bunches using extreme light intensities.

Main Methods:

  • Utilizing sub-two-cycle light pulses of extreme intensity (10^6 times higher than previous works).
  • Irradiating nanometric tungsten needles to create nanoplasmas.
  • Analyzing electron acceleration through a two-step mechanism.

Main Results:

  • Generation of multi-MeV energy electron bunches from tungsten nanoneedles.
  • Demonstration of steering electron energy and direction via near-field and laser fields.
  • Identification of a two-step acceleration mechanism involving near-field ejection and vacuum acceleration.

Conclusions:

  • The study demonstrates a novel method for relativistic electron acceleration in nanoplasmas.
  • Observations pave the way for isolating and controlling relativistic attosecond electron bunches.
  • This research opens prospects for next-generation electron and photon sources.