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Area of Science:

  • Optics and Photonics
  • Plasma Physics
  • Materials Science

Background:

  • Surface plasmon resonance (SPR) offers enhanced optical fields.
  • Controlling field polarization is crucial for applications like particle acceleration.
  • Femtosecond laser pulses enable ultrafast phenomena studies.

Purpose of the Study:

  • To demonstrate control over the field polarization of SPR-enhanced optical fields.
  • To achieve doubled intensity enhancement using a novel excitation scheme.
  • To investigate its application in enhancing ultrafast electron acceleration.

Main Methods:

  • Utilizing a polarization-gated excitation scheme with two counter-incident femtosecond laser pulses.
  • Employing the Kretschmann configuration for SPR excitation.
  • Developing a simplified analytical model to study spatiotemporal evolution and electron dynamics.

Main Results:

  • Achieved linear field polarization with doubled intensity enhancement.
  • Demonstrated enhanced maximum kinetic energy for accelerated electrons.
  • Analyzed the spatiotemporal evolution of the optical field and electron emission characteristics.

Conclusions:

  • The polarization-gated excitation scheme effectively controls SPR-enhanced optical fields for doubled intensity.
  • This technique significantly boosts the performance of ultrafast electron acceleration.
  • The analytical model provides insights into electron dynamics and energy gain.