A synthetic biological quantum optical system

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 coupl...

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Bibliographic Details
Published in:Nanoscale 2018-01, Vol.10 (27), p.13064-13073
Main Authors: Lishchuk, Anna, Kodali, Goutham, Mancini, Joshua A, Broadbent, Matthew, Darroch, Brice, Mass, Olga A, Nabok, Alexei, Dutton, P Leslie, Hunter, C Neil, Törmä, Päivi, Leggett, Graham J
Format: Article
Language:English
Subjects:
BASIC BIOLOGICAL SCIENCES
Binding sites
Coupled modes
Coupling
Dimers
Emitters
Excitons
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Light-Harvesting Protein Complexes - chemistry
MATERIALS SCIENCE
Models, Chemical
Optical Devices
Porphyrins
Proteins
Quantum Dots
Quantum Theory
Surface Plasmon Resonance
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Summary: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.
ISSN:2040-3364
2040-3372
DOI:10.1039/c8nr02144a