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Nonlocality-driven supercontinuum white light generation in plasmonic nanostructures.

A V Krasavin1, P Ginzburg1,2, G A Wurtz1

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Area of Science:

  • Nanophotonics
  • Nonlinear Optics
  • Condensed Matter Physics

Background:

  • Structured plasmonic metals offer nanoscale nonlinear functionalities by confining electromagnetic fields.
  • Optical nonlinearities in metals are governed by conduction electron dynamics, influenced by nonlocal effects at the nanoscale.

Purpose of the Study:

  • To investigate the role of nonlocal corrections in defining the nonlinear properties of plasmonic nanostructures.
  • To explore harmonic generation in metallic nanospirals using a detailed electron plasma model.

Main Methods:

  • Utilizing a full non-perturbative time-domain hydrodynamic description of electron plasma.
  • Employing numerical simulations for femtosecond excitation of metallic Archimedean nanospirals.

Main Results:

  • Nonlocal effects are shown to be crucial in determining nonlinear optical responses, beyond their minor role in linear optics.
  • The quantum pressure term in the nonlinear hydrodynamic model leads to the emergence of fractional nonlinear harmonics.
  • Broadband coherent white-light generation was observed, driven by these novel nonlinear phenomena.

Conclusions:

  • Nonlocality of the electron response fundamentally defines new nonlinear phenomena in metallic nanostructures.
  • The findings open avenues for advanced light generation and manipulation at the nanoscale.
  • This research highlights the importance of nonlocal effects in designing next-generation plasmonic devices.