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Updated: Sep 14, 2025
07:39
Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
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Plasmon-exciton polaritonic emission lifetime dynamics under strong coupling
Povilas Jurkšaitis1, Justina Anulytė1, Evita Spalinskaitė1
1Plasmonics and Nanophotonics Lab., Department of Laser Technologies, Center for Physical Sciences and Technology, Saulėtekio av. 3, LT-10257 Vilnius, Lithuania.
Nanophotonics (Berlin, Germany)
|July 21, 2025
Summary
This study explores how excitation conditions affect polariton decay in strongly coupled rhodamine 6G (R6G) and surface plasmon polaritons (SPPs). We observed longer-than-expected lifetimes, suggesting additional energy transfer pathways influencing quantum optical nanodevices.
Area of Science:
- Quantum optics
- Condensed matter physics
- Nanophotonics
Background:
- Surface plasmon polaritons (SPPs) are light-driven oscillations on metal surfaces.
- Rhodamine 6G (R6G) is a fluorescent dye with exciton properties.
- Strong coupling occurs when SPPs and excitons interact intensely.
Purpose of the Study:
- Investigate polariton decay dynamics under resonant and non-resonant excitation.
- Quantify coupling strength between R6G excitons and SPPs.
- Understand energy transfer mechanisms influencing polariton lifetimes.
Main Methods:
- Total Internal Reflection Ellipsometry (TIRE) for dispersion relations.
- Fluorescence spectroscopy for emission analysis.
- Back focal plane imaging and fluorescence lifetime measurements.
Main Results:
- Confirmed strong coupling with a coupling strength (g) of approximately 200 meV.
- Observed significantly longer fluorescence lifetimes (ps) than expected (fs) in the plasmonic strong coupling regime.
- Demonstrated emission from the lower polariton branch (LP).
Conclusions:
- Measured lifetimes indicate the influence of additional energy levels, likely an incoherent transition from an exciton reservoir to the LP.
- Understanding these coherent energy exchange dynamics is crucial for developing quantum optical nanodevices, polaritonic lasers, and achieving polariton condensation.
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