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A bimetallic nanoantenna for directional colour routing
Open accessAbstract
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. Plasmon resonances occur as collective excitations of surface electrons in noble metal nanoparticles. This study presents a new way of manipulating their behaviour by creating bimetallic dimers which, as a result of their asymmetric composition, give rise to unusual optical properties.
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Resonant dielectric nanostructures: a low-loss platform for functional nanophotonics
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Metadata
- Authors
- Shegai, T., Chen, S., Miljković, V. D., Zengin, G., Johansson, P., & Käll, M.
- Venue
- Nature Communications
- Published
- 2011-09-20
- Volume
- 2
- Issue
- 1
- Pages
- 481-481
- ISSN
- 2041-1723 (ISSN-L)
- OpenAlex
- W2076572034
- Cited by
- 347
- References
- 37
- FWCI
- 18.23
- Type
- journal article
- Language
- en
- Open access
- hybrid
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