Title:
Theory and simulation of surface plasmon excitation using resonant metal nanoparticle arrays
Author(s):
Amitabh Ghoshal, Pieter G. Kik
Source:
JOURNAL OF APPLIED PHYSICS 103
Vol./Issue/Date:
29.03.2008
Year:
2009
Page(s):
113111-1 - 113111-8
Keywords:
Abstract:
We discuss a plasmonic coupling device consisting of a periodic array of ellipsoidal silver
nanoparticles embedded in SiO2 and placed near a silver surface. By tuning the shape of the
particles in the array, the nanoparticle plasmon resonance is tuned. The resulting resonantly
enhanced fields near the nanoparticles, in turn, excite surface plasmons on the metal film. We have
performed finite integration technique simulations of such a plasmon coupler, optimized for
operation near a wavelength of 676 nm. Analysis of the frequency dependent electric field at
different locations in the simulation volume reveals the separate contributions of the particle and
surface resonance to the excitation mechanism. A coupled oscillator model describing the
nanoparticle and the metal film as individual resonators is introduced and is shown to reproduce the
trends observed in the simulations. Implications of our analysis on the resonantly enhanced
excitation of surface plasmons are discussed.
Document:
Reference Id:
425
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