Strong coupling between chlorosomes of photosynthetic bacteria and a confined optical cavity mode

David M. Coles, Yanshen Yang, Yaya Wang, Richard T. Grant, Robert A. Taylor, Semion K. Saikin (), Alán Aspuru-Guzik, David G. Lidzey, Joseph Kuo-Hsiang Tang () and Jason M. Smith ()
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David M. Coles: University of Oxford
Yanshen Yang: Clark University
Yaya Wang: Clark University
Richard T. Grant: University of Sheffield
Robert A. Taylor: University of Oxford
Semion K. Saikin: Harvard University
Alán Aspuru-Guzik: Harvard University
David G. Lidzey: University of Sheffield
Joseph Kuo-Hsiang Tang: Clark University
Jason M. Smith: University of Oxford

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract Strong exciton–photon coupling is the result of a reversible exchange of energy between an excited state and a confined optical field. This results in the formation of polariton states that have energies different from the exciton and photon. We demonstrate strong exciton–photon coupling between light-harvesting complexes and a confined optical mode within a metallic optical microcavity. The energetic anti-crossing between the exciton and photon dispersions characteristic of strong coupling is observed in reflectivity and transmission with a Rabi splitting energy on the order of 150 meV, which corresponds to about 1,000 chlorosomes coherently coupled to the cavity mode. We believe that the strong coupling regime presents an opportunity to modify the energy transfer pathways within photosynthetic organisms without modification of the molecular structure.

Date: 2014
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DOI: 10.1038/ncomms6561

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