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Related Experiment Video

Updated: Apr 17, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

Percolating plasmonic networks for light emission control.

Michele Gaio¹, Marta Castro-Lopez, Jan Renger

¹Department of Physics, King's College London, Strand, London WCR 2LS, UK. michele.gaio@kcl.ac.uk riccardo.sapienza@kcl.ac.uk.

Faraday Discussions

|February 26, 2015

Summary

This summary is machine-generated.

Local electromagnetic fields in plasmonic nanoantennas significantly influence light emission. These nanoantennas, featuring fractal gold networks near percolation, show that local properties dominate fluorescence modification, not long-range interactions.

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Last Updated: Apr 17, 2026

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Area of Science:

Nanophotonics
Plasmonics
Materials Science

Background:

Optical nanoantennas enable precise manipulation of single photons in nanostructured environments.
Complex plasmonic architectures offer multiscale control over light wavelength and mode matching.

Purpose of the Study:

Investigate the impact of plasmonic network formation on light emission from embedded fluorescent probes.
Analyze the interplay between global and local optical properties in self-assembled and lithographic gold films.

Main Methods:

Fabrication and characterization of self-assembled semi-continuous gold films and lithographic gold networks.
Fluorescence dynamics experiments to probe light-matter interactions.
Analysis of local density of optical states (LDOS) fluctuations near the electrical percolation threshold.

Main Results:

Plasmonic networks exhibit large LDOS fluctuations around the percolation threshold, characterized by fractal topology.
Both global long-range interactions (percolation, fractality) and local near-field effects influence fluorescence.
Local electromagnetic field contributions and network topology were found to be the dominant factors in fluorescence modification.

Conclusions:

Local optical properties of plasmonic nanoantennas play a critical role in modifying light emission.
The fractal topology and electrical percolation of gold networks significantly impact plasmonic behavior.
Understanding local near-field effects is key for designing advanced nanophotonic devices.