Near-field-induced tunability of surface plasmon polaritons in composite metallic nanostructures

We numerically study near-field-induced coupling effects in metal nanowire-based composite nanostructures. Our multi-layer system is composed of individual gold nanowires supporting localized particle plasmons at optical wavelengths, and a spatially separated homogeneous silver slab supporting deloc...

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Bibliographic Details
Published in:Journal of microscopy (Oxford) 2008-02, Vol.229 (2), p.344-353
Main Authors: CHRIST, A, LÉVÊQUE, G, MARTIN, O.J.F, ZENTGRAF, T, KUHL, J, BAUER, C, GIESSEN, H, TIKHODEEV, S.G
Format: Article
Language:English
Subjects:
Interaction
magnetic activity
near-fields
surface plasmon polaritons
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Summary:We numerically study near-field-induced coupling effects in metal nanowire-based composite nanostructures. Our multi-layer system is composed of individual gold nanowires supporting localized particle plasmons at optical wavelengths, and a spatially separated homogeneous silver slab supporting delocalized surface plasmons. We show that the localized plasmon modes of the composite structure, forming so-called magnetic atoms, can be controlled over a large spectral range by changing the thickness of the nearby metal slab. The optical response of single-wire and array-based metallic structures are compared. Spectral shifts due to wire-mirror interaction as well as the coupling between localized and delocalized surface plasmon modes in a magnetic photonic crystal are demonstrated. The presented effects are important for the optimization of metal-based nanodevices and may lead to the realization of metamaterials with novel plasmonic functionalities.
ISSN:0022-2720
1365-2818
DOI:10.1111/j.1365-2818.2008.01911.x