Plasmon dispersion in metal nanoparticle chains from angle-resolved scattering

Details Plasmon dispersion in metal nanoparticle chains from angle-resolved scattering Plasmon dispersion in metal nanoparticle chains from angle-resolved scattering

2007-07-18

arxiv.org/abs/0707.2731v1

Physics

Condensed Matter

Other Condensed Matter

4.1 page, 4 figures, color

Scientific paper

We present angle and frequency resolved optical extinction measurements to determine the dispersion relation of plasmon modes on Ag and Au nanoparticle chains with pitches down to 75 nm. The large splitting between transverse and longitudinal modes and the band curvature are inconsistent with electrostatic near-field models. Good agreement with an electrodynamic point-dipole model implies lower propagation loss and a larger signal bandwidth and group velocity than previously predicted. We conclude that for the design of optical nanocircuits coherent far-field couplings across the entire circuit need to be taken into account, even at subwavelength feature sizes.

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