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Title: 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.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [6] ;  [7] ;  [1]
  1. Univ. of Sheffield, Brook Hill, Sheffield (United Kingdom). Dept. of Chemistry
  2. Univ. of Sheffield, Western Bank, Sheffield (United Kingdom). Dept. of Molecular Biology and Biotechnology
  3. Univ. of Pennsylvania, Philadelphia, PA (United States). Johnson Research Foundation and Dept. of Biochemistry and Biophysics
  4. North Carolina State Univ., Raleigh, NC (United States). Dept. of Chemistry
  5. Univ. of Cambridge (United Kingdom). Cavendish Lab., Dept. of Physics
  6. Univ. of Sheffield, Western Bank, Sheffield (United Kingdom). Dept. of Molecular Biology and Biotechnology
  7. Aalto Univ., Aalto (Finland). School of Science. COMP Centre of Excellence, Dept. of Applied Physics
Publication Date:
Grant/Contract Number:
SC0001035
Type:
Published Article
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 16; Journal Issue: 11; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
Washington Univ., St. Louis, MO (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1334197
Alternate Identifier(s):
OSTI ID: 1425482