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A bimetallic nanoantenna for directional colour routing

Author

Listed:
  • Timur Shegai

    (Chalmers University of Technology)

  • Si Chen

    (Chalmers University of Technology)

  • Vladimir D. Miljković

    (Chalmers University of Technology)

  • Gülis Zengin

    (Chalmers University of Technology)

  • Peter Johansson

    (Chalmers University of Technology
    School of Science and Technology, Örebro University)

  • Mikael Käll

    (Chalmers University of Technology)

Abstract

Recent progress in nanophotonics includes demonstrations of meta-materials displaying negative refraction at optical frequencies, directional single photon sources, plasmonic analogies of electromagnetically induced transparency and spectacular Fano resonances. The physics behind these intriguing effects is to a large extent governed by the same single parameter—optical phase. Here we describe a nanophotonic structure built from pairs of closely spaced gold and silver disks that show phase accumulation through material-dependent plasmon resonances. The bimetallic dimers show exotic optical properties, in particular scattering of red and blue light in opposite directions, in spite of being as compact as ∼λ3/100. These spectral and spatial photon-sorting nanodevices can be fabricated on a wafer scale and offer a versatile platform for manipulating optical response through polarization, choice of materials and geometrical parameters, thereby opening possibilities for a wide range of practical applications.

Suggested Citation

  • Timur Shegai & Si Chen & Vladimir D. Miljković & Gülis Zengin & Peter Johansson & Mikael Käll, 2011. "A bimetallic nanoantenna for directional colour routing," Nature Communications, Nature, vol. 2(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:2:y:2011:i:1:d:10.1038_ncomms1490
    DOI: 10.1038/ncomms1490
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