Journal
ACS PHOTONICS
Volume 4, Issue 3, Pages 489-494Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.6b00979
Keywords
dielectric nanoantennas; directional scattering; magnetic resonances; tuning of scattering direction
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Funding
- EPSRC Reactive Plasmonics Programme [EP/M013812/1]
- Leverhulme Trust (UK)
- ONR Global
- U.S. Army Transatlantic Research Office
- Natural Sciences and Engineering Research Council under its Discovery Grants Program
- EPSRC [EP/L024926/1, EP/M013812/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M013812/1, EP/L024926/1] Funding Source: researchfish
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Due to the presence of strong magnetic resonances, high refractive index dielectric nanoantennnas have shown the ability to expand the methods available for controlling electromagnetic waves in the subwavelength region. In this work, we experimentally demonstrate that an asymmetric dielectric dimer made of silicon can lead to highly directional scattering depending on the excitation wavelength, due to the interference of the excited magnetic resonances. A back focal plane imaging system combined with a prism coupling technique enables us to explore the scattering profile parallel to the substrate. The directivity of scattering along the substrate is high enough to produce selective guiding of light along the substrate. These results showing tunable control of directional scattering will encourage the realization of novel optical applications, such as optical nanocircuitry.
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