Open AccessA standing-wave interpretation of plasmon resonance excitation in split-ring resonators
Author(s) -
Wen Yu Chen,
Chun Hung Lin
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.014280
Subject(s) - split ring resonator , plasmon , optics , excitation , physics , polarization (electrochemistry) , resonance (particle physics) , resonator , electric field , excited state , surface plasmon resonance , ray , surface plasmon , atomic physics , chemistry , quantum mechanics , nanoparticle
In this study, we investigated the plasmon resonances of split-ring resonators (SRRs) numerically at incident angles of 0 and 45 degrees under illumination with linearly and circularly polarized waves. At 45 degrees incidence, perpendicular polarized waves excited distinct odd plasmon modes; the difference in the reflections of right and left circularly polarized incident radiation was very large. From simulated near field plots, we found that the parallelism of the incident electric field and the induced plasmon current was the key factor affecting excitation. We propose the use of a parallelism factor (P-factor), based on a standing-wave approach, to characterize the ability of incident fields to excite multiple plasmon resonance currents. The mechanism of the field and current parallelism can explain the resonance behavior of SRRs when considering the polarization state, incident angle, and geometry of the SRR.