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Light Emission from Plasmonic Nanostructures Enhanced with Fluorescent Nanodiamonds.

Abstract：

:In the surface-enhanced fluorescence (SEF) process, it is well known that the plasmonic nanostructure can enhance the light emission of fluorescent emitters. With the help of atomic force microscopy, a hybrid system consisting of a fluorescent nanodiamond and a gold nanoparticle was assembled step-by-step for in situ optical measurements. We demonstrate that fluorescent emitters can also enhance the light emission from gold nanoparticles which is judged through the intrinsic anti-Stokes emission owing to the nanostructures. The light emission intensity, spectral shape, and lifetime of the hybrid system were dependent on the coupling configuration. The interaction between gold nanoparticles and fluorescent emitter was modelled based on the concept of a quantised optical cavity by considering the nanodiamond and the nanoparticle as a two-level energy system and a nanoresonator, respectively. The theoretical calculations reveal that the dielectric antenna effect can enhance the local field felt by the nanoparticle, which contributes more to the light emission enhancement of the nanoparticles rather than the plasmonic coupling effect. The findings reveal that the SEF is a mutually enhancing process. This suggests the hybrid system should be considered as an entity to analyse and optimise surface-enhanced spectroscopy.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zhao J,Cheng Y,Shen H,Hui YY,Wen T,Chang HC,Gong Q,Lu G

doi

10.1038/s41598-018-22019-z

subject

Has Abstract

pub_date

2018-02-26 00:00:00

pages

3605

issue

1

issn

2045-2322

pii

10.1038/s41598-018-22019-z

journal_volume

8

pub_type

杂志文章

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