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Gold–Silica–Gold Nanosandwiches: Tunable Bimodal Plasmonic Resonators

Authors

  • Alexandre Dmitriev Dr.,

    1. Department of Applied Physics, Chalmers University of Technology, 41296 Göteborg, Sweden, Fax: (+46) 317-723-134
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  • Tavakol Pakizeh,

    1. Department of Applied Physics, Chalmers University of Technology, 41296 Göteborg, Sweden, Fax: (+46) 317-723-134
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  • Mikael Käll Prof.,

    1. Department of Applied Physics, Chalmers University of Technology, 41296 Göteborg, Sweden, Fax: (+46) 317-723-134
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  • Duncan S. Sutherland Prof.

    1. Department of Applied Physics, Chalmers University of Technology, 41296 Göteborg, Sweden, Fax: (+46) 317-723-134
    2. Interdisciplinary Nanoscience Center (iNANO), Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark
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  • We acknowledge financial support from the European Commission’s Marie Curie Fellowship program (A.D.), the Swedish Institute (T.P.), the Swedish Foundation for Strategic Research, and the Swedish Research Council.

Abstract

original image

A metal–dielectric sandwich nanostructure, fabricated by a self-assembly technique, has a bimodal resonant response at optical frequencies due to dipolar plasmon hybridization (see picture). The degree of electromagnetic coupling in the system can be controlled by either varying the aspect ratio of one of the disks in the layered structure, or by altering the thickness of the dielectric spacer between the plasmonic components.

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