Plasmon Resonances in V-Shaped Gold Nanostructures

Publication Type:
Journal Article
Citation:
Plasmonics, 2012, 7 (2), pp. 235 - 243
Issue Date:
2012-06-01
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Using numerical simulations, we examine the change in plasmon resonance behavior in gold nanorod structures that have a V shape. The reduction in symmetry compared to linear rods causes two different longitudinal-type resonances to appear in a single structure, and the relative intensity and hybridization of these can be controlled by varying the angle of the arms of the "V." The resonances may also be selectively excited by controlling the polarization of the incident light, thereby providing a convenient way to control a nanoscale optical electric field using far-field parameters. For example, the wavelength at which a strong resonance occurs in the V-shaped structures studied can be switched between 630 and 900 nm by a 90° rotation of the polarization of the incident light. Due to the symmetry of the targets, there will be three types of special near-field location; a location at which the electric field intensity is enhanced by either resonance, a location at which the electric field intensity is enhanced by the 630 nm resonance but not by the 890 nm resonance, and a location at which the electric field intensity is enhanced by the 890 nm resonance but not by the 630 nm one. © 2011 Springer Science+Business Media, LLC.
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