A synthetic biological quantum optical system

Research output: Contribution to journalArticle


  • Anna Lishchuk
  • Goutham Kodali
  • Joshua A. Mancini
  • Matthew Broadbent
  • Brice Darroch
  • Olga A. Mass
  • Alexei Nabok
  • P. Leslie Dutton
  • C. Neil Hunter
  • Professor Päivi Törmä

  • Graham J. Leggett

Research units

  • University of Sheffield
  • University of Pennsylvania
  • North Carolina State University
  • Sheffield Hallam University


In strong plasmon-exciton coupling, a surface plasmon mode is coupled to an array of localized emitters to yield new hybrid light-matter states (plexcitons), whose properties may in principle be controlled via modification of the arrangement of emitters. We show that plasmon modes are strongly coupled to synthetic light-harvesting maquette proteins, and that the coupling can be controlled via alteration of the protein structure. For maquettes with a single chlorin binding site, the exciton energy (2.06 ± 0.07 eV) is close to the expected energy of the Qy transition. However, for maquettes containing two chlorin binding sites that are collinear in the field direction, an exciton energy of 2.20 ± 0.01 eV is obtained, intermediate between the energies of the Qx and Qy transitions of the chlorin. This observation is attributed to strong coupling of the LSPR to an H-dimer state not observed under weak coupling.


Original languageEnglish
Pages (from-to)13064-13073
Number of pages10
Issue number27
Publication statusPublished - 21 Jul 2018
MoE publication typeA1 Journal article-refereed

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