Strong Coupling of Localized Surface Plasmons to Excitons in Light-Harvesting Complexes.
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.
Department of Chemistry, University of Sheffield , Brook Hill, Sheffield S3 7HF, U.K.
Anna
A
Tsargorodska
Department of Molecular Biology and Biotechnology, University of Sheffield , Western Bank, Sheffield S10 2TN, U.K.
Michaël L
ML
Cartron
Department of Molecular Biology and Biotechnology, University of Sheffield , Western Bank, Sheffield S10 2TN, U.K.
Cvetelin
C
Vasilev
The Johnson Research Foundation and Department of Biochemistry and Biophysics, University of Pennsylvania , Philadelphia, Pennsylvania 10104, United States.
Goutham
G
Kodali
Department of Chemistry, North Carolina State University , Raleigh, North Carolina 27695, United States.
Olga A
OA
Mass
Cavendish Laboratory, Dept. of Physics, University of Cambridge , J. J. Thomson Ave, Cambridge, CB3 0HE, U.K.
Jeremy J
JJ
Baumberg
The Johnson Research Foundation and Department of Biochemistry and Biophysics, University of Pennsylvania , Philadelphia, Pennsylvania 10104, United States.
P Leslie
PL
Dutton
Department of Molecular Biology and Biotechnology, University of Sheffield , Western Bank, Sheffield S10 2TN, U.K.
C Neil
CN
Hunter
COMP Centre of Excellence, Department of Applied Physics, Aalto University, School of Science , P.O. Box 15100, 00076 Aalto, Finland.
Päivi
P
Törmä
Department of Chemistry, University of Sheffield , Brook Hill, Sheffield S3 7HF, U.K.
Graham J
GJ
Leggett
Strong coupling; light harvesting complexes; photosynthesis; plasmonic nanoparticles; purple bacteria
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