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Strong antenna-enhanced fluorescence of a single light-harvesting complex shows photon antibunching.
Wientjes, Emilie; Renger, Jan; Curto, Alberto G; Cogdell, Richard; van Hulst, Niek F.
Afiliación
  • Wientjes E; ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain.
  • Renger J; ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain.
  • Curto AG; 1] ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain [2] Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA.
  • Cogdell R; Institute of Biomedical and Life Sciences, University of Glasgow, Biomedical Research Building, Glasgow G12 8QQ, UK.
  • van Hulst NF; 1] ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain [2] ICREA-Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain.
Nat Commun ; 5: 4236, 2014 Jun 23.
Article en En | MEDLINE | ID: mdl-24953833
The nature of the highly efficient energy transfer in photosynthetic light-harvesting complexes is a subject of intense research. Unfortunately, the low fluorescence efficiency and limited photostability hampers the study of individual light-harvesting complexes at ambient conditions. Here we demonstrate an over 500-fold fluorescence enhancement of light-harvesting complex 2 (LH2) at the single-molecule level by coupling to a gold nanoantenna. The resonant antenna produces an excitation enhancement of circa 100 times and a fluorescence lifetime shortening to ~20 ps. The radiative rate enhancement results in a 5.5-fold-improved fluorescence quantum efficiency. Exploiting the unique brightness, we have recorded the first photon antibunching of a single light-harvesting complex under ambient conditions, showing that the 27 bacteriochlorophylls coordinated by LH2 act as a non-classical single-photon emitter. The presented bright antenna-enhanced LH2 emission is a highly promising system to study energy transfer and the role of quantum coherence at the level of single complexes.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Rhodopseudomonas / Proteínas Bacterianas / Complejos de Proteína Captadores de Luz / Nanoestructuras Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2014 Tipo del documento: Article País de afiliación: España Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Rhodopseudomonas / Proteínas Bacterianas / Complejos de Proteína Captadores de Luz / Nanoestructuras Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2014 Tipo del documento: Article País de afiliación: España Pais de publicación: Reino Unido