Nano Archive

Fluorescence enhancement in hot spots of AFM-designed gold nanoparticle sandwiches

Bek, Alpan and Jansen, Reiner and Ringler, Moritz and Mayilo, Sergiy and Klar, Thomas A. and Feldmann, Jochen (2008) Fluorescence enhancement in hot spots of AFM-designed gold nanoparticle sandwiches. NANO LETTERS, 8 (2). pp. 485-490.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl072602n

Abstract

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.

Item Type:Article
Subjects:Analytical Science > Microscopy and probe methods
Material Science > Nanostructured materials
ID Code:3255
Deposited By:Farnush Anwar
Deposited On:15 Jan 2009 15:33
Last Modified:28 Jan 2009 16:22

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