Optical cavity-mediated exciton dynamics in photosynthetic light harvesting 2 complexes

Fan Wu, Daniel Finkelstein-Shapiro, Mao Wang, Ilmari Rosenkampff, Arkady Yartsev, Torbjörn Pascher, Tu C. Nguyen- Phan, Richard Cogdell, Karl Börjesson and Tönu Pullerits ()
Additional contact information
Fan Wu: Lund University
Daniel Finkelstein-Shapiro: Lund University
Mao Wang: University of Gothenburg
Ilmari Rosenkampff: Lund University
Arkady Yartsev: Lund University
Torbjörn Pascher: Lund University
Tu C. Nguyen- Phan: University of Glasgow
Richard Cogdell: University of Glasgow
Karl Börjesson: University of Gothenburg
Tönu Pullerits: Lund University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Strong light-matter interaction leads to the formation of hybrid polariton states and alters the photophysical dynamics of organic materials and biological systems without modifying their chemical structure. Here, we experimentally investigated a well-known photosynthetic protein, light harvesting 2 complexes (LH2) from purple bacteria under strong coupling with the light mode of a Fabry-Perot optical microcavity. Using femtosecond pump probe spectroscopy, we analyzed the polariton dynamics of the strongly coupled system and observed a significant prolongation of the excited state lifetime compared with the bare exciton, which can be explained in terms of the exciton reservoir model. Our findings indicate the potential of tuning the dynamic of the whole photosynthetic unit, which contains several light harvesting complexes and reaction centers, with the help of strong exciton-photon coupling, and opening the discussion about possible design strategies of artificial photosynthetic devices.

Date: 2022
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DOI: 10.1038/s41467-022-34613-x

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