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Electromagnetic interactions in plasmonic nanoparticle arrays.

Alexandre Bouhelier1, Renaud Bachelot, Jin Seo Im

  • 1Chemistry Division and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary
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Surface plasmon resonance in silver nanoparticle arrays shifts to red wavelengths as particle spacing decreases below 200 nm. This shift, linked to near-field interactions, differs between 2D arrays and 1D gold chains.

Area of Science:

  • Plasmonics
  • Nanoparticle Spectroscopy
  • Condensed Matter Physics

Background:

  • Surface plasmon resonance (SPR) is a key phenomenon in nanoparticle optics.
  • Understanding interparticle interactions is crucial for controlling plasmonic properties.

Purpose of the Study:

  • Investigate SPR in two-dimensional (2D) silver arrays and one-dimensional (1D) gold chains.
  • Determine the influence of interparticle distance, particle size, and particle number on SPR.
  • Compare interactions in 2D arrays versus 1D chains.

Main Methods:

  • Dark-field surface plasmon spectroscopy was employed.
  • Systematic variation of interparticle distance, particle size, and particle number.
  • Analysis of spectral shifts and resonance broadening.

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Main Results:

  • A red shift in SPR was observed for 2D silver arrays with lattice spacings below 200 nm.
  • This red shift correlated with significant resonance broadening, indicating near-field interactions.
  • Distinct differences in long-range and short-range interaction contributions were found between 2D arrays and 1D chains.

Conclusions:

  • Near-field interactions significantly impact SPR in closely spaced 2D nanoparticle arrays.
  • The interplay of interparticle interactions differs fundamentally between 2D and 1D nanoparticle systems.
  • Results align with and support recent theoretical predictions on plasmonic coupling.