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

Tsargorodska, Anna; Cartron, Michaël L.; Vasilev, Cvetelin; Kodali, Goutham; Mass, Olga A.; Baumberg, Jeremy J.; Dutton, P. Leslie; Hunter, C. Neil; Törmä, Päivi; Leggett, Graham J.

doi:10.1021/acs.nanolett.6b02661

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

Journal Article · 30 September 2016 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.6b02661 · OSTI ID:1334197

Tsargorodska, Anna ^[1]; Cartron, Michaël L. ^[2]; Vasilev, Cvetelin ^[2]; Kodali, Goutham ^[3]; Mass, Olga A. ^[4]; Baumberg, Jeremy J. ^[5]; Dutton, P. Leslie ^[3]; Hunter, C. Neil ^[6]; Törmä, Päivi ^[7]; Leggett, Graham J. ^[1]

Univ. of Sheffield, Brook Hill, Sheffield (United Kingdom). Dept. of Chemistry
Univ. of Sheffield, Western Bank, Sheffield (United Kingdom). Dept. of Molecular Biology and Biotechnology
Univ. of Pennsylvania, Philadelphia, PA (United States). Johnson Research Foundation and Dept. of Biochemistry and Biophysics
North Carolina State Univ., Raleigh, NC (United States). Dept. of Chemistry
Univ. of Cambridge (United Kingdom). Cavendish Lab., Dept. of Physics
Univ. of Sheffield, Western Bank, Sheffield (United Kingdom). Dept. of Molecular Biology and Biotechnology
Aalto Univ., Aalto (Finland). School of Science. COMP Centre of Excellence, Dept. of Applied Physics

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.

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Research Organization:: Washington Univ., St. Louis, MO (United States); Energy Frontier Research Centers (EFRC) (United States). Photosynthetic Antenna Research Center (PARC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001035

OSTI ID:: 1334197

Alternate ID(s):: OSTI ID: 1425482

Journal Information:: Nano Letters, Vol. 16, Issue 11; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 58 works

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