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Updated: Apr 26, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Directional fluorescence emission by individual V-antennas explained by mode expansion
V-shaped plasmonic antennas achieve unidirectional light scattering for nanoscale directional control. Their performance depends critically on emitter position, offering insights for advanced optical devices.
Area of Science:
- Nanophotonics
- Plasmonics
- Metamaterials
Background:
- Plasmonic antennas enable nanoscale light manipulation through directional scattering.
- Compact antenna geometries are crucial for practical applications.
- V-shaped nanorods offer a simple yet effective design for broken rotational symmetry.
Purpose of the Study:
- To investigate the unidirectional scattering properties of V-shaped plasmonic antennas.
- To elucidate the fundamental mechanisms behind their directional light control capabilities.
- To explore the influence of emitter position on scattering directivity.
Main Methods:
- Rigorous eigenmode expansion analysis of V-antennas.
- Experimental measurements of scattered plane wave radiation patterns.
- Characterization of fluorescent emitter patterns around the antenna.
Main Results:
- V-antennas exhibit unidirectional scattering of dipole emission, opposite to plane wave scattering.
- High directivity (up to 6 dB) is achieved at specific emitter positions.
- Eigenmode analysis reveals the interference effects governing directional behavior.
Conclusions:
- V-antennas provide tunable nanoscale directional light control.
- Understanding emitter-antenna coupling is key for optimizing directivity.
- The findings offer a foundation for designing novel nanoscale directional scatterers.
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