Opt Express. 2011 Mar 14;19(6):4949-56. doi: 10.1364/OE.19.004949.

Generation of pronounced Fano resonances and tuning of subwavelength spatial light distribution in plasmonic pentamers.

Optics express

M Rahmani, B Lukiyanchuk, B Ng, A Tavakkoli K G, Y F Liew, M H Hong

PMID: 21445130 DOI: 10.1364/OE.19.004949

Abstract

Arrays of plasmonic pentamers consisting of five metallic nano-disks were designed and fabricated to achieve a pronounced Fano Resonance with polarization-independent far-field spectral response at normal incidence due to the structure symmetry of pentamers. A mass-spring coupled oscillator model was applied to study plasmon interactions among the nano-disks. It was found that the direction of the excitation light polarization can flexibly tune the spatial localization of near-field energy at sub-wavelength scales while the collective optical properties are kept constant. It can lead to a selective storage of excited energy down to sub-20 nm gap at a normal incident with a single light source.

Publication Types

• Journal Article
• Research Support, Non-U.S. Gov't