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Related Experiment Video

Updated: Sep 17, 2025

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

Critical coupling in plasmonic chain for efficient energy trapping.

Marius Crouzier^1,2, Fei Mao¹, Giovanni Magno³

¹Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies, Palaiseau, 91120, France.

Scientific Reports

|July 2, 2025

Summary

This summary is machine-generated.

Researchers developed a new plasmonic nanoparticle chain and silicon waveguide system. This system achieves critical coupling, trapping 99% of light energy for advanced nanophotonics applications.

Keywords:

Critical coupling Integrated waveguide Nanoparticle chain Plasmons Temporal coupled-mode theory

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Last Updated: Sep 17, 2025

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Area of Science:

Nanophotonics
Plasmonics
Optical Engineering

Background:

Plasmonic nanoparticles concentrate energy at the nanoscale, enabling applications in lab-on-chip devices and photonic circuits.
Efficient coupling between nanoparticles and excitation signals is vital for these applications.
Plasmonic nanoparticle chains guide light at subwavelength scales and can be excited by dielectric waveguides.

Purpose of the Study:

To propose and demonstrate a novel plasmonic chain-dielectric waveguide configuration.
To enable free positioning of the plasmonic chain relative to the waveguide.
To achieve a critical coupling regime for enhanced energy transfer.

Main Methods:

Developing a novel configuration for plasmonic chain-dielectric waveguide structures.
Precisely controlling the separation distance between the silicon waveguide and the plasmonic chain.
Analyzing the energy transfer and coupling dynamics.

Main Results:

Demonstrated a critical coupling regime between a silicon waveguide and a plasmonic chain.
Observed a transition of the plasmonic chain from a transmission mode to a cavity state.
Achieved trapping of 99% of the waveguide's energy within the plasmonic chain.

Conclusions:

The proposed configuration enables efficient addressing of nanostructures using integrated waveguides.
This breakthrough facilitates the development of advanced optical nano-tweezers, sensors, and nano-heaters.
The critical coupling regime offers a new pathway for light manipulation at the nanoscale.