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Energetic electrons up to 10 times the ponderomotive potential (Up) were observed in multiphoton laser-matter interactions. This was achieved using infrared lasers and plasmonic nanoemitters, enhancing electron rescattering.

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Area of Science:

  • Strong-field physics
  • Quantum optics
  • Materials science

Background:

  • Energetic electron generation in laser-matter interactions is crucial for various applications.
  • Previous studies showed electron energies up to 10 times the ponderomotive potential (Up) via photoemission and rescattering.
  • Enhancing rescattering probability is key to achieving higher electron energies.

Purpose of the Study:

  • To investigate the generation of energetic electrons in the multiphoton-induced regime.
  • To explore the combined effect of infrared lasers and plasmonic nanoemitters on electron rescattering.
  • To reveal novel aspects of ultrafast electron dynamics.

Main Methods:

  • Utilizing infrared laser sources to exploit the quadratic scaling of the ponderomotive potential (Up).
  • Employing plasmonic nanoemitters to significantly enhance electron rescattering probability.
  • Conducting experiments within the multiphoton-induced regime.
  • Modeling results using the time-dependent Schrödinger equation.

Main Results:

  • Observed rescattered electrons with energies up to approximately 10 times the ponderomotive potential (∼10Up).
  • Demonstrated the effectiveness of combining infrared lasers and plasmonic nanoemitters for energetic electron generation.
  • Validated experimental findings with a time-dependent Schrödinger equation model.
  • Uncovered unexpected dynamics in ultrafast electron behavior.

Conclusions:

  • The combination of infrared lasers and plasmonic nanoemitters enables efficient generation of high-energy rescattered electrons in the multiphoton regime.
  • This approach offers a pathway to control and enhance electron energies in laser-matter interactions.
  • The study provides new insights into ultrafast electron dynamics, particularly in multiphoton emission processes.