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Proceedings Paper

Plasmonic hybrid nanostructure with controlled interaction strength
Author(s): Justyna K. Grzelak; Bartosz Krajnik; Mark D. Thoreson; Piotr Nyga; Vladimir M. Shalaev; Sebastian Mackowski
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Paper Abstract

In this report we discuss the influence of plasmon excitations in a silver island film on the fluorescence of photosynthetic complex, peridinin-chlorophyll-protein (PCP). Control of the separation between these two components is obtained by fabricating a wedge layer of silica across the substrate, with a thickness from 0 to 46 nm. Continuous variation of the silica thickness allows for gradual change of interaction strength between plasmon excitations in the metallic film and the excited states of pigments comprising photosynthetic complexes. While the largest separation between the silver film and photosynthetic complexes results in fluorescence featuring a mono-exponential decay and relatively narrow distribution of intensities, the PCP complexes placed on thinner silica spacers show biexponential fluorescence decay and significantly broader distribution of total fluorescence intensities. This broad distribution is a signature of stronger sensitivity of fluorescence enhancement upon actual parameters of a hybrid nanostructure. By gradual change of the silica spacer thickness we are able to reproduce classical distance dependence of fluorescence intensity in plasmonic hybrid nanostructures on ensemble level. Experiments carried out for different excitation wavelengths indicate that the interaction is stronger for excitations resonant with plasmon absorption in the metallic layer.

Paper Details

Date Published: 3 March 2014
PDF: 8 pages
Proc. SPIE 8957, Plasmonics in Biology and Medicine XI, 89570N (3 March 2014); doi: 10.1117/12.2039578
Show Author Affiliations
Justyna K. Grzelak, Nicolaus Copernicus Univ. (Poland)
Bartosz Krajnik, Nicolaus Copernicus Univ. (Poland)
Mark D. Thoreson, Purdue Univ. (United States)
Piotr Nyga, Purdue Univ. (United States)
Military Univ. of Technology (Poland)
Vladimir M. Shalaev, Purdue Univ. (United States)
Sebastian Mackowski, Nicolaus Copernicus Univ. (Poland)

Published in SPIE Proceedings Vol. 8957:
Plasmonics in Biology and Medicine XI
Tuan Vo-Dinh; Joseph R. Lakowicz, Editor(s)

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