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Photonics 2015, 2(3), 838-854; doi:10.3390/photonics2030838

Effects of Irregular Bimetallic Nanostructures on the Optical Properties of Photosystem I from Thermosynechococcus elongatus

1
IPTC and Lisa+ Center, University of Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
2
Laboratory of Nanotechnology, Instrumentation and Optics, University of Technology of Troyes, 12 Rue Marie Curie, CS 42060, 10004 Troyes Cedex, France
3
Laboratory of Materials, Catalysis, Environment and Analytical Methods, Lebanese University, Campus Rafic Hariri, Hadath-Beirut, Lebanon
4
Zurich University of Applied Science Winterthur (ZHAW), Technikumstrasse 13, 8401 Winterthur, Switzerland
*
Author to whom correspondence should be addressed.
Received: 29 June 2015 / Revised: 17 July 2015 / Accepted: 19 July 2015 / Published: 23 July 2015
(This article belongs to the Special Issue New Frontiers in Plasmonics and Metamaterials)
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Abstract

The fluorescence of photosystem I (PSI) trimers in proximity to bimetallic plasmonic nanostructures have been explored by single-molecule spectroscopy (SMS) at cryogenic temperature (1.6 K). PSI serves as a model for biological multichromophore-coupled systems with high potential for biotechnological applications. Plasmonic nanostructures are fabricated by thermal annealing of thin metallic films. The fluorescence of PSI has been intensified due to the coupling with plasmonic nanostructures. Enhancement factors up to 22.9 and 5.1 are observed for individual PSI complexes coupled to Au/Au and Ag/Au samples, respectively. Additionally, a wavelength dependence of fluorescence enhancement is observed, which can be explained by the multichromophoric composition of PSI. View Full-Text
Keywords: plasmonic; bimetallic nanostructures; thermal annealing; photosystem I; single-molecule spectroscopy; fluorescence emission enhancement plasmonic; bimetallic nanostructures; thermal annealing; photosystem I; single-molecule spectroscopy; fluorescence emission enhancement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ashraf, I.; Skandary, S.; Khaywah, M.Y.; Metzger, M.; Meixner, A.J.; Adam, P.M.; Brecht, M. Effects of Irregular Bimetallic Nanostructures on the Optical Properties of Photosystem I from Thermosynechococcus elongatus. Photonics 2015, 2, 838-854.

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