A bimetallic nanoantenna for directional colour routing
Journal article, 2011

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 similar to lambda(3)/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.



field enhancement


gold nanosandwiches



visible frequencies


Timur Shegai

Chalmers, Applied Physics, Bionanophotonics

Si Chen

Chalmers, Applied Physics, Bionanophotonics

Vladimir Miljkovic

Chalmers, Applied Physics, Bionanophotonics

Gülis Zengin

Chalmers, Applied Physics, Bionanophotonics

Peter Johansson

Chalmers, Applied Physics, Bionanophotonics

Mikael Käll

Chalmers, Applied Physics, Bionanophotonics

Nature Communications

2041-1723 (ISSN) 20411723 (eISSN)

Vol. 2 1 481

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Other Engineering and Technologies



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