Open AccessOptical plasmonic resonances in split-ring resonator structures: an improved LC model
Author(s) -
T. D. Corrigan,
P. W. Kolb,
A. B. Sushkov,
H. D. Drew,
D. C. Schmadel,
R. J. Phaneuf
Publication year - 2008
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.019850
Subject(s) - optics , plasmon , resonance (particle physics) , resonator , physics , rod , molecular physics , fano resonance , materials science , atomic physics , medicine , alternative medicine , pathology
We systematically investigate the resonant behavior of arrays of Ag nano-structures ranging from isolated simple rods, to U-shapes, to single split ring structures. We show that the lowest order plasmonic resonance associated with a rod red shifts as we create a U and SRR into the position normally associated with a simple LC mode. A second mode red shifts and grows in intensity as we extend the arms of the U-shape, and a third mode appears in the spectra as we close the arms and form a split ring structure. We performed simulations of the structures and examine the E-field and current density. The simulations show that the current path is different for these modes. We examine the behavior of the lowest order mode in detail, discuss the effects of skin depth, and present an improved LC model to describe this resonance.