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Related Experiment Video

Updated: May 22, 2026

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions
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Distance dependent quenching effect in nanoparticle dimers.

Alessia Polemi1, Kevin L Shuford

  • 1Department of Chemistry, Drexel University, 3141 Chestnut Street, Philadelphia, Pennsylvania 19104, USA.

The Journal of Chemical Physics
|May 16, 2012
PubMed
Summary

We studied how molecules emit light within nanoparticle dimers. Increasing dimer size saturates emission, approaching a parallel plate waveguide behavior, with quenching only at very small gaps.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Quantum Optics

Background:

  • Understanding light emission from molecules near plasmonic nanostructures is crucial for applications in sensing and light harvesting.
  • Nanoparticle dimers offer unique electromagnetic field confinement, significantly altering molecular emission properties.

Purpose of the Study:

  • To investigate the emission characteristics of a molecule within a nanoparticle dimer.
  • To analyze the influence of dimer size and geometry on molecular emission.
  • To compare dimer configurations with single nanoparticle and parallel plate waveguide models.

Main Methods:

  • Modeling the molecule as a dipolar source coupled to the nanoparticle dimer.
  • Calculating local field enhancement and quantum yield.

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Last Updated: May 22, 2026

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions
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  • Investigating the effect of varying nanoparticle radius and inter-particle gap distance.
  • Deriving and comparing with an analytical solution for a parallel plate waveguide geometry.

    • Main Results:

    • Emission intensity saturates with increasing nanoparticle radius, mimicking parallel plate waveguide behavior.
    • A significant quenching effect on emission is observed only at extremely small inter-nanoparticle gap distances.
    • Strong coupling between the dimer and molecule dominates energy transfer, except when the molecule is very close to the metal surface.

    Conclusions:

    • Nanoparticle dimer geometry significantly controls molecular emission, with size-dependent saturation effects.
    • The parallel plate waveguide model serves as a useful approximation and provides insight into underlying physical mechanisms.
    • Optimizing nanoparticle separation is key to managing emission enhancement and avoiding quenching in molecular-plasmonic systems.