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research article

Near-field mediated enhancement of two-photon induced fluorescence on plasmonic nanostructures

Fischer, Janina
•
Bocchio, Noelia  
•
Unger, Andreas
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2010
Journal of Physical Chemistry C

We investigate two-photon-induced fluorescence for organic chromophores next to elongated gold disks which support plasmonic resonances. By polyelectrolyte coating, the dye is placed in a defined concentration at a defined distance from the surface. A fluorescence enhancement for two-photon excitation is found in spite of a quenched emission. The measured fluorescence is always accompanied by an autoluminescence from the gold, which is of similar intensity. The fluorescence signal is strongly reduced when no plasmonic resonance is excited, while the gold autoluminescence remains of considerable strength, pointing to different enhancement mechanisms for the two processes. When the dimension of the nanostructure is within the resolution limit of the microscope, we observe double-spot patterns at the edges of the structure. We suggest this is a direct visualization of the electrical near-field.

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Type
research article
DOI
10.1021/jp105339b
Author(s)
Fischer, Janina
Bocchio, Noelia  
Unger, Andreas
Butt, Hans-Jürgen
Koynov, Kaloian
Kreiter, Maximilian
Date Issued

2010

Publisher

American Chemical Society

Published in
Journal of Physical Chemistry C
Volume

114

Start page

20968

End page

20973

Subjects

plasmonics, two photon

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
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Available on Infoscience
November 18, 2010
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/57762
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