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Plasmonic bandgaps and Trapped Plasmons on Nanostructured Metal Surfaces

T. A. Kelf·Y. Sugawara·J. J. Baumberg·M. Abdelsalam·P. N. Bartlett
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Abstract

Nanostructured metal surfaces comprised of periodically arranged spherical voids are grown by electrochemical deposition through a self-assembled template. Detailed measurements of the angle- and orientation-dependent reflectivity reveal the spectral dispersion, from which we identify the presence of both delocalized Bragg- and localized Mie-plasmons. These couple strongly producing bonding and anti-bonding mixed plasmons with anomalous dispersion properties. Appropriate plasmon engineering of the void morphology selects the plasmon spatial and spectral positions, allowing these plasmonic crystal films to be optimised for a wide range of sensing applications.

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T. A. Kelf, Y. Sugawara, J. J. Baumberg, M. Abdelsalam, P. N. Bartlett. 2005-11-07. Plasmonic bandgaps and Trapped Plasmons on Nanostructured Metal Surfaces. https://doi.org/10.1103/physrevlett.95.116802

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