Journal
OPTICS EXPRESS
Volume 19, Issue 6, Pages 4949-4956Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.004949
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Funding
- SERC Agency of Science, Technology And Research (A*STAR) [092 154 0099]
- A*STAR - SINGA
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Arrays of plasmonic pentamers consisting of five metallic nanodisks 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. (C) 2011 Optical Society of America
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