Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 77: Poster: Plasmonics and Nanooptics
O 77.3: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Plasmonic fluorescence enhancement in cyanobacterial Photosystem I — •Daniel Fersch1, Sebastian Pres1, Bernhard Huber1, Viktor Lisinetskii1, Heiko Lokstein2, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, 97074 Würzburg, Germany — 2Department of Chemical Physics and Optics, Charles University Prague, 121 16 Praha 2, Czech Republic
We investigate plasmon-enhanced fluorescence in thin films of Photosystem I (PS I) spin-coated with Au nanorods. Single hot spots attributed to the plasmonic fluorescence enhancement were observed by laser-scanning fluorescence microscopy. The extremely weak fluorescence signal of PS I excited by a HeNe laser is filtered by lock-in amplification.
The role of PS I is light-induced electron donation, so an interesting question is whether plasmonic interaction has an effect on the rate of charge separation, and thus photoelectron emission. To measure this we plan to extract the electrons from the PS I using photoemission electron microscopy. Finally, we intend to combine this method with ultrafast multidimensional spectroscopy to track transfer dynamics in space and time [1].
[1] M. Aeschlimann et al., Science 333, 1723 (2011)