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Related Experiment Videos

Surface-enhanced optical third-harmonic generation in Ag island films.

E M Kim1, S S Elovikov, T V Murzina

  • 1Department of Physics, Moscow State University, 119992 Moscow, Russia.

Physical Review Letters
|December 31, 2005
PubMed
Summary

Surface-enhanced optical third-harmonic generation (THG) in silver island films shows over 100-fold intensity increase. This enhancement in THG is due to local plasmon resonance in silver nanoparticles.

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Area of Science:

  • * Nonlinear optics
  • * Plasmonics
  • * Materials science

Background:

  • * Third-harmonic generation (THG) is a nonlinear optical process.
  • * Silver nanoparticles exhibit unique plasmonic properties.
  • * Surface enhancement effects are crucial for boosting nonlinear optical signals.

Purpose of the Study:

  • * To investigate surface-enhanced third-harmonic generation (THG) in silver island films.
  • * To quantify the enhancement factor of THG from silver nanoparticles compared to a smooth silver surface.
  • * To understand the underlying mechanisms responsible for the enhanced THG signal.

Main Methods:

  • * Fabrication of silver island films with nanoparticles.
  • * Measurement of THG intensity using optical spectroscopy.

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  • * Analysis of the spectral and polarization properties of the generated THG signal.

    • Main Results:

    • * Observed significant surface enhancement of THG in silver island films.
    • * Achieved THG intensity enhancement exceeding 2 orders of magnitude compared to a smooth silver surface.
    • * Identified local plasmon excitation and resonance at the third-harmonic wavelength as the primary enhancement mechanism.
    • * Attributed the diffuse and depolarized THG component to third-order hyper-Rayleigh scattering.

    Conclusions:

    • * Silver island films provide substantial enhancement for third-harmonic generation.
    • * Local plasmon resonance is key to achieving significant THG enhancement.
    • * Hyper-Rayleigh scattering contributes to the observed diffuse THG signal.