DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2008 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 5: Photobiophysics

BP 5.2: Vortrag

Montag, 25. Februar 2008, 16:30–16:45, PC 203

Metal - enhanced fluorescence of chlorophylls in single light - harvesting complexes — •Sebastian Mackowski1,2, Stephan Wörmke1, Andreas Maier1, Tatas Brotosudarmo3, Hayk Harutyunyan1, Achim Hartschuh1, Alexander Govorov4, Hugo Scheer3, and Christoph Bräuchle11Department of Chemistry and Biochemistry, Ludwig-Maximilian-University, Munich, GERMANY — 2Insitute of Physics, Nicolaus Copernicus University, Torun, POLAND — 3Department of Biology, Ludwig-Maximilian-University, Munich, GERMANY — 4Department of Physics and Astronomy, Ohio University, Athens OH, USA

Ensemble and single-molecule spectroscopy demonstrates that both emission and absorption of peridinin-chlorophyll-protein photosynthetic antennae can be largely enhanced through plasmonic interactions. We find up to 18-fold increase of the chlorophyll fluorescence for complexes placed near a silver metal layer. This enhancement, which leaves no measurable effects on the protein structure, is observed when exciting either chlorophyll or carotenoid and is attributed predominantly to an increase of the excitation rate in the antenna. The enhancement mechanism comes from plasmon-induced amplification of electromagnetic fields inside the complex. This result is an important step toward applying plasmonic nanostructures for controlling the optical response of complex biomolecules and improving the design and functioning of artificial light-harvesting systems.

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