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

نویسندگان

  • W Andrew Murray
  • James R Suckling
  • William L Barnes
چکیده

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.

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عنوان ژورنال:
  • Nano letters

دوره 6 8  شماره 

صفحات  -

تاریخ انتشار 2006