Ultrafast energy transfer and excitonic coupling in an artificial photosynthetic antenna

M. Maiuri, J. J. Snellenburg, I. H M Van Stokkum, S. Pillai, D. Gust, Thomas Moore, Ana Moore, R. Van Grondelle, G. Cerullo, D. Polli

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In photosynthetic organisms carotenoids (Car) and (bacterio)chlorophylls harvest sunlight in peripheral antennas and subsequent transfer the energy to the reaction center, with almost 100% efficiency in some systems [1]. In this work we studied an artificial supramolecule composed of a Car with 10 conjugated double bonds linked to a phthalocyanine (Pc) [2], mimicking the light harvesting unity [3]. We follow the selective excitation of Car, monitoring the ultrafast rise of the Pc population. The Car→Pc ET process occurs from the bright Car S2 excited state and competes with an internal conversion (IC) process towards the lower-lying dark Car S1 excited state. To establish the relative weight of these two deactivation pathways, we performed pump-probe experiments with sub-20-fs temporal resolution [4] on the isolated Car and on the dyad and compared the excited state dynamics. In addition, following selective excitation of the Pc, we have identified the spectral signatures of the S1 excited state of the Car which appear within the ≈50-fs time resolution of our measurement. This strongly indicates excited state coupling between the S1 state of Car and the S1 state of Pc, with important implications for the regulation of photosynthetic activity.

Original languageEnglish (US)
Title of host publication2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013
PublisherIEEE Computer Society
DOIs
StatePublished - 2013
Event2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013 - Munich, Germany
Duration: May 12 2013May 16 2013

Other

Other2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013
CountryGermany
CityMunich
Period5/12/135/16/13

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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    Maiuri, M., Snellenburg, J. J., Van Stokkum, I. H. M., Pillai, S., Gust, D., Moore, T., Moore, A., Van Grondelle, R., Cerullo, G., & Polli, D. (2013). Ultrafast energy transfer and excitonic coupling in an artificial photosynthetic antenna. In 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013 [6801981] IEEE Computer Society. https://doi.org/10.1109/CLEOE-IQEC.2013.6801981