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Updated: Jun 25, 2025

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Non-thermal emission in gap-mode plasmon photoluminescence
Robert Lemasters1, Manoj Manjare2, Ryan Freeman2
1Department of Physics, Emory University, Atlanta, GA, 30322, USA. robertdlemasters@gmail.com.
Nonlinear photoluminescence in plasmonic nanostructures is influenced by hot electrons. Precise confinement reveals non-thermal contributions, offering new ways to control light conversion using nanoscale nonequilibrium electron states.
Area of Science:
- Plasmonics and Nanophotonics
- Solid-State Physics
- Quantum Optics
Background:
- Photoluminescence in plasmonic nanostructures shows complex nonlinear behaviors.
- The role of hot electrons and localized plasmonic modes is debated.
Purpose of the Study:
- Investigate the origins of nonlinear photoluminescence in plasmonic nanostructures.
- Clarify the influence of excited carrier distribution and plasmonic modes.
Main Methods:
- Utilized plasmonic gap-mode resonators with nanoscale confinement.
- Analyzed photoluminescence spectra and carrier dynamics.
Main Results:
- Nonlinear photoluminescence dominated by non-thermal contributions.
- Excited carrier population deviates from Fermi-Dirac distribution due to confinement-induced absorption.
- Demonstrated the impact of large-momentum carrier absorption beyond the dipole approximation.
Conclusions:
- Confinement in plasmonic gap-mode resonators significantly alters carrier behavior.
- Non-thermal effects are crucial for understanding nonlinear photoluminescence.
- Opens new avenues for nanoscale light conversion using nonequilibrium electron states.
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