Overlayers on silver nanotriangles: Field confinement and spectral position of localized surface plasmon resonances

Nano Lett. 2006 Aug;6(8):1772-7. doi: 10.1021/nl060812e.

Abstract

We studied the spectral evolution of plasmon modes associated with silver nanotriangles as a function of dielectric overlayer thickness in the range of 5-300 nm. A substantial red-shift of the resonance is observed that oscillates with increasing over-layer thickness. We explain this previously unreported oscillation through the cavity quantum electrodynamical effect of the array of triangles combined with the dielectric overlayer. The red-shift, though substantial, is less than expected. Comparison with numerical models indicates that this discrepancy is due to very tight field confinement around the tips of the triangles.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Computer Simulation
  • Light
  • Models, Chemical*
  • Models, Molecular*
  • Nanostructures / analysis
  • Nanostructures / chemistry*
  • Particle Size
  • Quantum Theory
  • Silver / analysis
  • Silver / chemistry*
  • Spin Labels
  • Surface Plasmon Resonance / methods*

Substances

  • Spin Labels
  • Silver