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How Light Is Emitted by Plasmonic Metals.

Jan Mertens1, Marie-Elena Kleemann1, Rohit Chikkaraddy1

  • 1NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge CB3 0HE, United Kingdom.

Nano Letters
|March 8, 2017
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Summary
This summary is machine-generated.

Light emission from plasmonic metals is explained by prompt electronic Raman scattering, not photoluminescence. This finding provides a model for maximizing light emission in gold and silver nanostructures.

Keywords:
Landau dampingPlasmonnanogapnanoparticle on mirrorphotoluminescence

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Materials Science

Background:

  • The mechanism of light emission from plasmonic metals like gold and silver remains debated, especially below interband transition energies.
  • Understanding this emission is crucial for developing novel light-emitting nanodevices.

Purpose of the Study:

  • To elucidate the fundamental mechanism of light emission from plasmonic nanostructures.
  • To differentiate between prompt electronic Raman scattering and photoluminescence in metal nanoconstructs.
  • To provide a model for optimizing light emission from metallic nanostructures.

Main Methods:

  • Utilizing nanoscale plasmonic cavities with blue-pumped excitation.
  • Observing light emission correlated with dark-field scattering on individual nanoconstructs.
  • Spectrally tuning plasmons via atomic-scale restructuring of nanocavity facets in gold, silver, and mixed nanoparticles-on-mirror.

Main Results:

  • Observed direct correlation between light emission and dark-field scattering across a broad spectral range (600-900 nm).
  • Identified prompt electronic Raman scattering as the dominant emission mechanism.
  • Ruled out photoluminescence as the primary process due to the absence of phase and energy relaxation.

Conclusions:

  • Prompt electronic Raman scattering, not photoluminescence, governs light emission in plasmonic nanostructures.
  • The findings offer a mechanistic understanding applicable to various metal nanoconstructs and geometries.
  • A model is proposed to guide the maximization of light emission from plasmonic metals.