Open AccessOptical response of linear chains of metal nanospheres and nanospheroids
Author(s) -
Stephen J. Norton,
Tuan VoDinh
Publication year - 2008
Publication title -
journal of the optical society of america. a, optics, image science, and vision./journal of the optical society of america. a, online
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.803
H-Index - 158
eISSN - 1520-8532
pISSN - 1084-7529
DOI - 10.1364/josaa.25.002767
Subject(s) - multipole expansion , spheres , spherical harmonics , chain (unit) , electric field , materials science , plasmon , field (mathematics) , nanoparticle , physics , molecular physics , optics , nanotechnology , quantum mechanics , mathematics , pure mathematics , astronomy
A semi-analytical method for computing the electric field surrounding a finite linear chain of metal nanospheres and nanospheroids is described. In treating chains or clusters of spheres, a common approach is to use the spherical-harmonic addition theorem to relate the multipole expansion coefficients between different spheres. A method is described here that avoids the use of spherical-harmonic addition theorems, which are not applicable to spheroidal chains. Simulations are given that illustrate the large field enhancements that can occur in the gaps between silver nanoparticles arising from plasmon resonances.