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A bimetallic nanoantenna for directional colour routing
Timur Shegai1, Si Chen, Vladimir D Miljković
1Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden. timurs@chalmers.se
Nature Communications
|September 22, 2011
Summary
Researchers developed compact bimetallic nanodisks that sort light by color and direction. This nanophotonic device utilizes material-dependent plasmon resonances for advanced optical control.
Area of Science:
- Nanophotonics and Plasmonics
- Metamaterials and Nanostructures
Background:
- Recent nanophotonics advancements include metamaterials with negative refraction, directional single photon sources, and plasmonic phenomena like electromagnetically induced transparency and Fano resonances.
- Optical phase is a key parameter governing many of these nanophotonic effects.
Purpose of the Study:
- To describe a novel nanophotonic structure capable of manipulating optical phase through material-dependent plasmon resonances.
- To demonstrate exotic optical properties, specifically the directional scattering of different light wavelengths.
Main Methods:
- Fabrication of bimetallic nanodimers composed of closely spaced gold and silver disks.
- Characterization of optical properties, focusing on spectral and spatial light scattering behavior.
- Investigation of phase accumulation via material-dependent plasmon resonances.
Main Results:
- The bimetallic nanodimers exhibit significant phase accumulation due to material-dependent plasmon resonances.
- These compact nanostructures (∼λ(3)/100) demonstrate directional scattering of red and blue light in opposite directions.
- The devices function as spectral and spatial photon-sorting nanodevices.
Conclusions:
- The developed bimetallic nanodimers offer a versatile platform for controlling optical responses.
- Wafer-scale fabrication is feasible, enabling practical applications in optical manipulation.
- Tunable optical response through polarization, material choice, and geometry opens new possibilities.
