Repository logo
 

Strong Coupling of Localized Surface Plasmons to Excitons in Light-Harvesting Complexes.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Tsargorodska, Anna 
Cartron, Michaël L 
Vasilev, Cvetelin 
Kodali, Goutham 
Mass, Olga A 

Abstract

Gold nanostructure arrays exhibit surface plasmon resonances that split after attaching light harvesting complexes 1 and 2 (LH1 and LH2) from purple bacteria. The splitting is attributed to strong coupling between the localized surface plasmon resonances and excitons in the light-harvesting complexes. Wild-type and mutant LH1 and LH2 from Rhodobacter sphaeroides containing different carotenoids yield different splitting energies, demonstrating that the coupling mechanism is sensitive to the electronic states in the light harvesting complexes. Plasmon-exciton coupling models reveal different coupling strengths depending on the molecular organization and the protein coverage, consistent with strong coupling. Strong coupling was also observed for self-assembling polypeptide maquettes that contain only chlorins. However, it is not observed for monolayers of bacteriochlorophyll, indicating that strong plasmon-exciton coupling is sensitive to the specific presentation of the pigment molecules.

Description

Keywords

Strong coupling, light harvesting complexes, photosynthesis, plasmonic nanoparticles, purple bacteria

Journal Title

Nano Lett

Conference Name

Journal ISSN

1530-6984
1530-6992

Volume Title

16

Publisher

American Chemical Society (ACS)
Sponsorship
Engineering and Physical Sciences Research Council (EP/G060649/1)
Engineering and Physical Sciences Research Council (EP/L027151/1)
European Research Council (320503)
Engineering and Physical Sciences Research Council (EP/H007024/1)
Engineering and Physical Sciences Research Council (EP/K028510/1)