Generation and manipulation of ultrahigh order plasmon resonances in visible and near-infrared region

• DOI: 10.1364/oe.23.010836
• Publication Date: 2015-04-17T18:04:11Z
• Authors: Yanni Wu; Hairong Zheng; Junna Li; Chi Wang; Caixia Li; Jun Dong
• Keywords: Nanoring; Fano resonance; Nanorod; Nanophotonics; Localized surface plasmon

Optical properties of periodic nanorings with built-in V-shaped nanowedges (NRBV) are investigated theoretically. Tunable ultrahigh order Fano resonances achieved and they found to be sensitive geometric parameters surrounding dielectric environment the planar nanostructure. High can suppressed or enhanced by adjusting opening angle nanowedge, size nanoring aspect ratio nanowedge. Moreover, manipulating offset filling dielectrics asymmetrically revive when nanowedge develops into a straight nanorod. Meanwhile, stronger plasmon emerge alternately in two parts this This plasmonic nanostructure produces electric field enhancement, which have great potential applications multi-wavelength surface spectroscopy biochemical sensing.