Dye fluorescence enhancement and quenching by gold nanoparticles: Direct near-field microscopic observation of shape dependence

Noriko Nishizawa Horimoto, Kohei Imura, Hiromi Okamoto

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

We investigated the enhancement and quenching of dye fluorescence by single gold nanoparticles using an aperture-type scanning near-field optical microscope to evaluate the shape dependence. Enhancement or reduction of fluorescence was found to be strongly dependent on the shape of the particle. Gold nanoplates showed significant fluorescence enhancement, as did aggregated nanoparticles for the most part. On the other hand, gold nanorods with high aspect ratios showed quenching effects. The results suggest that the electromagnetic near-field in the vicinity of the surface of nanoparticles, not just near the apex or the tip but the whole surface, is important for understanding fluorescence enhancement and quenching.

Original languageEnglish
Pages (from-to)105-109
Number of pages5
JournalChemical Physics Letters
Volume467
Issue number1-3
DOIs
Publication statusPublished - 2008 Dec 15
Externally publishedYes

Fingerprint

Gold
Quenching
near fields
Coloring Agents
dyes
Fluorescence
quenching
gold
Nanoparticles
fluorescence
nanoparticles
augmentation
high aspect ratio
optical microscopes
Nanorods
nanorods
Aspect ratio
apexes
Microscopes
apertures

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Physics and Astronomy(all)

Cite this

Dye fluorescence enhancement and quenching by gold nanoparticles : Direct near-field microscopic observation of shape dependence. / Horimoto, Noriko Nishizawa; Imura, Kohei; Okamoto, Hiromi.

In: Chemical Physics Letters, Vol. 467, No. 1-3, 15.12.2008, p. 105-109.

Research output: Contribution to journalArticle

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