Ultrafast energy transfer in light-harvesting chlorosomes from the green sulfur bacterium Chlorobium tepidum

Savikhin, Sergei; Noort, Paula I. van; Zhu, Yingting; Lin, Su; Blankenship, Robert E.

doi:10.1016/0301-0104(95)00019-k

Cited by 65 publications

(121 citation statements)

References 27 publications

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“…Such excitons are then transferred across these collective as well as single-pigment states. Ultrafast energy transfer in the chlorosomes has been reported previously [18][19][20] . While these studies did not observe coherent exciton dynamics, such a process cannot be excluded.…”

mentioning

confidence: 98%

Strong coupling between chlorosomes of photosynthetic bacteria and a confined optical cavity mode

et al. 2014

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Strong exciton-photon coupling is the result of a reversible exchange of energy between an excited state and a confined optical field. This results in the formation of polariton states that have energies different from the exciton and photon. We demonstrate strong exciton-photon coupling between light-harvesting complexes and a confined optical mode within a metallic optical microcavity. The energetic anti-crossing between the exciton and photon dispersions characteristic of strong coupling is observed in reflectivity and transmission with a Rabi splitting energy on the order of 150 meV, which corresponds to about 1,000 chlorosomes coherently coupled to the cavity mode. We believe that the strong coupling regime presents an opportunity to modify the energy transfer pathways within photosynthetic organisms without modification of the molecular structure.

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mentioning

confidence: 98%

Strong coupling between chlorosomes of photosynthetic bacteria and a confined optical cavity mode

et al. 2014

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“…Later energy is transferred on the time scale of tens of picosecond to the baseplate -a pigment protein complex attached to the side of chlorosome oriented towards the cell membrane. Additionally, coherent oscillations attributed to ground-state vibrational coherences were also observed [5][6][7].…”

Section: Introductionmentioning

confidence: 87%

Fast Exciton Dynamics and Coherent Oscillations Revealed by Coherent 2D Spectroscopy in Chlorosomes

Mančal

Vacha

Augulis

et al. 2013

EPJ Web of Conferences

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Abstract. In this study ultrafast energy transfer dynamics in chlorosomes from sulphur bacterium Chlorobaculum tepidum were explored by means of coherent electronic twodimensional spectroscopy. Observed sub-100 fs dynamics were attributed to incoherent downhill excitation diffusion between disordered domains within chlorosomes. At the same time vibrational coherent oscillations were investigated on the longer timescales.

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“…The depolarization time can be compared to the decoherence time estimated from the coherences in site basis in Section IV C. Note that the ultrafast depolarization time of sub-100 fs has not been resolved by earlier time-dependent polarization anisotropy experiments [26,29,30,33]. For example, the one-color TA anisotropy in the wavelength region of 720-790 nm has given a single decay time of 1.7-3.9 ps [30]. The lack of the ultrafast component in the earlier experiments is probably due to there limited time resolution.…”

Section: F Anisotropy Decaymentioning

confidence: 99%

“…The EET in chlorosomes have been studied using various time-resolved spectroscopy techniques [23,[26][27][28][29][30][31][32][33][34]. For later convenience, we briefly review the characteristic time scales measured for chlorosomes from Chlorobaculum tepidum (C. tepidum).…”

Section: Introductionmentioning

confidence: 99%

Theoretical characterization of excitation energy transfer in chlorosome light-harvesting antennae from green sulfur bacteria

et al. 2014

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We present a theoretical study of excitation dynamics in the chlorosome antenna complex of green photosynthetic bacteria based on a recently proposed model for the molecular assembly. Our model for the excitation energy transfer (EET) throughout the antenna combines a stochastic time propagation of the excitonic wave function with molecular dynamics simulations of the supramolecular structure, and electronic structure calculations of the excited states. We characterized the optical properties of the chlorosome with absorption, circular dichroism and fluorescence polarization anisotropy decay spectra. The simulation results for the excitation dynamics reveal a detailed picture of the EET in the chlorosome. Coherent energy transfer is significant only for the first 50 fs after the initial excitation, and the wavelike motion of the exciton is completely damped at 100 fs. Characteristic time constants of incoherent energy transfer, subsequently, vary from 1 ps to several tens of ps. We assign the time scales of the EET to specific physical processes by comparing our results with the data obtained from time-resolved spectroscopy experiments.

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Ultrafast energy transfer in light-harvesting chlorosomes from the green sulfur bacterium Chlorobium tepidum

Cited by 65 publications

References 27 publications

Strong coupling between chlorosomes of photosynthetic bacteria and a confined optical cavity mode

Strong coupling between chlorosomes of photosynthetic bacteria and a confined optical cavity mode

Fast Exciton Dynamics and Coherent Oscillations Revealed by Coherent 2D Spectroscopy in Chlorosomes

Theoretical characterization of excitation energy transfer in chlorosome light-harvesting antennae from green sulfur bacteria

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