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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Dielectric laser accelerators leverage electron-photon interactions for compact electron acceleration.
  • Metallic materials with surface plasmon enhancement show potential for high electron acceleration capabilities.

Purpose of the Study:

  • To present a metallic material-based on-chip laser-driven accelerator design.
  • To demonstrate remarkable electron acceleration capability using ultrafast electron microscopy.

Main Methods:

  • Designing periodic nanostructures, specifically a bowtie structure, for laser acceleration.
  • Investigating electron acceleration under phase-matching conditions.
  • Utilizing ultrafast electron microscopy to analyze electron energy states.

Main Results:

  • Achieved efficient and continuous acceleration of free electrons on a periodic nanostructure.
  • Obtained an asymmetric electron spectral structure with most electrons in energy-gain states.
  • Reached a maximum acceleration gradient of 0.335 GeV/m due to surface plasmon enhancement and nonlinear optical effects.

Conclusions:

  • Metallic laser accelerators are a viable approach for developing compact, on-chip accelerators.
  • The demonstrated acceleration gradient highlights the potential for significant advancements in accelerator technology.