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Fluorescence enhancement in hot spots of AFM-designed gold nanoparticle sandwiches
Date
2008-02-01
Author
Bek, Alpan
JANSEN, Reiner
RINGLER, Moritz
MAYILO, Sergiy
KLAR, Thomas A.
FELDMANN, Jochen
Metadata
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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We observe an enhancement of fluorescence from a single fluorescent sphere, which is sandwiched between two individual gold nanoparticles, forming a hot spot of strong field enhancement. The fluorescence enhancing hot spot is custom-designed by the deliberate assembly of gold nanoparticles with an atomic force microscope cantilever. The fluorescence intensity is monitored while the separation between the two gold nanoparticles is reduced by gradually pushing the gold nanoparticles closer to the fluorescent sphere. The fluorescence enhancement is maximal when the distance between the two gold nanoparticles is smallest, when the excitation polarization is parallel to the axis of the sandwich, and when the fluorescent sphere is positioned exactly on the axis connecting the two gold nanoparticles.
Subject Keywords
Atomic-force microscope
,
Raman-scattering
,
Silver electrode
,
Spontaneous emission
,
Surface
,
Molecule
,
Spectroscopy
,
Nanoantennas
,
Particles
,
Pyridine
URI
https://hdl.handle.net/11511/44798
Journal
NANO LETTERS
DOI
https://doi.org/10.1021/nl072602n
Collections
Department of Physics, Article