Excited state coherent dynamics in light-harvesting complexes from photosynthetic marine algae

We explore coherence dynamics in light-harvesting complexes and their interactions with other electronic states and vibrational modes. This is achieved by utilizing a two-colour four-wave mixing spectroscopy to excite and analyse a specific coherence pathway in the phycocyanin-645 (PC645) light-harv...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2012-08, Vol.45 (15), p.154015-1-8
Main Authors: Richards, G H, Wilk, K E, Curmi, P M G, Quiney, H M, Davis, J A
Format: Article
Language:English
Subjects:
decoherence
femtosecond spectroscopy
phonon coupling
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Summary:We explore coherence dynamics in light-harvesting complexes and their interactions with other electronic states and vibrational modes. This is achieved by utilizing a two-colour four-wave mixing spectroscopy to excite and analyse a specific coherence pathway in the phycocyanin-645 (PC645) light-harvesting complex. We observe the dephasing rate increase as a function of temperature and oscillations in the signal intensity as a function of waiting time which reveals coherent excitation of pathways not directly resonant with the laser pulses. This coherent excitation of non-resonant electronic states implies strong coupling to phonon modes, which is necessary if coherent energy transfer between non-resonant states is to play any role in photosynthetic energy transfer.
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/45/15/154015