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A Bouhelier1, F Ignatovich, A Bruyant

  • 1Institut Carnot de Bourgogne, CNRS-UMR 5209, Université de Bourgogne, 21078 Dijon, France. alexandre.bouhelier@u-bourgogne.fr

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Summary

We demonstrate a new method to excite surface plasmon polaritons using a focused laser beam on a metal film without needing special structures. This technique allows for controlled excitation of standing surface plasmon polaritons.

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Area of Science:

  • Plasmonics
  • Optics
  • Materials Science

Background:

  • Surface plasmon polaritons (SPPs) are collective electron oscillations at metal-dielectric interfaces.
  • Exciting SPPs typically requires specific surface structures like gratings or nanoparticles.
  • Understanding SPP excitation is crucial for applications in nanophotonics and sensing.

Purpose of the Study:

  • To introduce a novel, simplified method for exciting SPPs.
  • To investigate the excitation of interfering surface plasmon polaritons (SPPs) using a focused laser beam.
  • To demonstrate local control over SPP excitation patterns on a planar metal film.

Main Methods:

  • Utilizing a focused laser beam incident normally onto a planar metal film.
  • Employing the angular spectrum representation to analyze the excitation mechanism.
  • Experimentally varying the axial position of the laser focus relative to the metal surface.

Main Results:

  • Successfully excited SPPs without requiring surface protrusions or holes.
  • Observed distinct intensity distribution patterns on the metal surface based on focus position.
  • Demonstrated interference patterns from counterpropagating SPPs and two-lobe patterns for localized SPPs.

Conclusions:

  • The proposed method offers a simple and versatile approach for SPP excitation.
  • The angular spectrum method accurately explains the experimental observations.
  • This technique enables localized and controlled excitation of standing SPPs.