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Related Experiment Video

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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

Published on: December 11, 2013

Plasmonic mediated interactions between waveguides and nanostructured metal surfaces.

P A Porta1, B Corbett

  • 1Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland. pierpaolo.porta@tyndall.ie

Optics Express
|October 15, 2008
PubMed
Summary

We observed a resonant decrease in light reflectivity from optical waveguides interacting with gold nanostructures. This phenomenon arises from a novel coupled waveguide-plasmonic surface mode, not simple surface roughness.

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Area of Science:

  • * Photonics and Plasmonics
  • * Optical Engineering
  • * Materials Science

Background:

  • * Optical waveguides confine and guide light.
  • * Plasmonic nanostructures interact strongly with light.
  • * Coupling light into waveguides typically requires precise alignment.

Purpose of the Study:

  • * To investigate optical reflectance properties of TE mode waveguides on nanostructured gold.
  • * To identify the mechanism behind angle-dependent resonant reflectivity changes.
  • * To model the observed optical phenomena.

Main Methods:

  • * Measurement of polarization-resolved, angular-dependent optical reflectance.
  • * Fabrication of single TE mode optical waveguides in contact with nanostructured gold surfaces.
  • * Development of a coupled mode theory model.

Main Results:

  • * A significant angle-dependent resonant decrease in TE polarized surface reflectivity was measured.
  • * The observed resonance could not be attributed to waveguide coupling via surface roughness.
  • * Evidence for the excitation of a coupled waveguide-plasmonic surface mode was found.

Conclusions:

  • * The interaction between metal nanostructures and waveguides creates a coupled waveguide-plasmonic surface mode.
  • * This coupled mode is responsible for the observed resonant optical reflectance.
  • * Coupled mode theory effectively explains the experimental data.