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

Authors:
Dr. Alpan Bek, PhD
Dr. Alpan Bek, PhD
Middle East Technical University
Associate Professor
Nano-Optics, plasmonics
Ankara | Turkey

Nano Lett 2008 Feb 4;8(2):485-90. Epub 2008 Jan 4.

Photonics and Optoelectronics Group, Physics Department and CENS, Ludwig-Maximilians-Universit√§t M√ľnchen, Amalienstrasse 54, 80799 Munich, Germany.

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.

Download full-text PDF

Source
http://dx.doi.org/10.1021/nl072602nDOI Listing
February 2008
4 Reads
18 Citations
13.592 Impact Factor

Publication Analysis

Top Keywords

gold nanoparticles
24
fluorescent sphere
12
hot spot
8
enhancement fluorescence
8
fluorescence enhancement
8
gold
7
nanoparticles
6
fluorescence
5
enhancing hot
4
fluorescence enhancing
4
spot custom-designed
4
polarization parallel
4
distance gold
4
custom-designed deliberate
4
reduced gradually
4
nanoparticles reduced
4
enhancement maximal
4
monitored separation
4
strong field
4
field enhancement
4

Similar Publications