Distance dependent quenching effect in nanoparticle dimers

The Journal of Chemical Physics
Alessia Polemi, Kevin L Shuford

Abstract

In this paper, we investigate the emission characteristics of a molecule placed in the gap of a nanoparticle dimer configuration. The emission process is described in terms of a local field enhancement factor and the overall quantum yield of the system. The molecule is represented as a dipolar source, with fixed length and fed by a constant current. We first describe the coupled dimer-molecule system and compare these results to a single sphere-molecule system. Next, the effect of dimer size is investigated by changing the radius of the nanoparticles. We find that when the radius increases, a saturation effect occurs that trends towards the case of a radiating dipole between two flat interfaces, which we refer to as a parallel plate waveguide geometry. An analytical solution for the parallel plate waveguide geometry is presented and compared to the results for the spherical dimer configuration. We use this approximation as a reference solution, and also, it provides useful guidelines to understand the physical mechanism behind the energy transfer between the molecule and the dimer. We find that the emission intensity undergoes a quenching effect only when the inter-nanoparticle gap distance of the dimer is very small, meaning t...Continue Reading

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Citations

Jul 15, 2016·Optics Express·Zhe ShenYao-Chun Shen
Nov 30, 2016·Physical Chemistry Chemical Physics : PCCP·Matthieu LoumaigneAnne Débarre
Aug 15, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Maxim Sukharev, Abraham Nitzan
Feb 12, 2015·Nanotechnology·N AbdellaouiA Pillonnet

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Methods Mentioned

BETA
surface enhanced Raman scattering

Software Mentioned

MATLAB
CST Microwave Studio

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