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Updated: Jul 6, 2025

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

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Electrochemically Switchable Multimode Strong Coupling in Plasmonic Nanocavities.

Yanji Yang¹, Rohit Chikkaraddy^2,3, Qianqi Lin^2,4

¹School of Physics, Trinity College Dublin, Dublin 2, D02 PN40, Ireland.

|January 2, 2024

Summary

This summary is machine-generated.

Methylene blue molecules exhibit reversible strong coupling with plasmonic nanocavities at room temperature, controllable via redox reactions. This quantum electrodynamics platform shows potential for active control in novel devices.

Keywords:

multimode strong coupling polariton formation strong coupling control, plasmonic nanocavities

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Area of Science:

Quantum optics
Plasmonics
Molecular spectroscopy

Background:

Strong coupling between quantum emitters and cavities is fundamental to quantum electrodynamics.
Methylene blue (MB) is a versatile dye with potential applications in quantum technologies.

Purpose of the Study:

To investigate the coherent interaction between methylene blue molecules and subwavelength plasmonic nanocavity modes.
To demonstrate the reversible switching of strong coupling via molecular redox reactions.

Main Methods:

Experimental observation of methylene blue-MB interaction with plasmonic nanocavity modes at room temperature.
Simulations to analyze strong coupling between cavity modes and molecular transitions.
Investigating the effect of molecular redox reactions on coupling strength.

Main Results:

Methylene blue molecules achieve coherent interaction and strong coupling with plasmonic nanocavity modes.
Strong coupling is reversibly switched on/off by redox reactions transforming MB to leuco-methylene blue.
Simulations reveal coupling with detuned modes, leading to spectral shifts and polariton formation.

Conclusions:

Reversible control of strong coupling in plasmonic nanocavities using molecular redox reactions is demonstrated.
The findings highlight the potential for active control of quantum interactions in molecular-plasmonic systems.
This research opens avenues for novel devices in quantum information and sensing.