2021
DOI: 10.1002/jbio.202100136
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Strong coupling between an optical microcavity and photosystems in single living cyanobacteria

Abstract: The first step in photosynthesis is an extremely efficient energy transfer mechanism that led to the debate to which extent quantum coherence may be involved in the energy transfer between the photosynthetic pigments. In search of such a coherent behavior, we have embedded living cyanobacteria between the parallel mirrors of an optical microresonator irradiated with low intensity white light. As a consequence, we observe vacuum Rabi splitting in the transmission and fluorescence spectra as a result of strong l… Show more

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Cited by 10 publications
(19 citation statements)
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“…Detailed values of the absolute, F0-normalized and FM-normalized data of quantum yield measurements in free-space, resonant and off-resonant microcavity are given in the supplementary information Table S1. Hence, only the resonant microcavity had a significant reductive impact on the quantum yield of single cyanobacteria, which also corresponds to previous fluorescence lifetime measurements of microcavity-enclosed cyanobacteria [9]. Since the same ambient conditions prevail in the free-space and resonant microcavity, we can assume that the quantum yield is solely influenced by the special light conditions, i.e.…”
Section: Measurement Resultssupporting
confidence: 81%
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“…Detailed values of the absolute, F0-normalized and FM-normalized data of quantum yield measurements in free-space, resonant and off-resonant microcavity are given in the supplementary information Table S1. Hence, only the resonant microcavity had a significant reductive impact on the quantum yield of single cyanobacteria, which also corresponds to previous fluorescence lifetime measurements of microcavity-enclosed cyanobacteria [9]. Since the same ambient conditions prevail in the free-space and resonant microcavity, we can assume that the quantum yield is solely influenced by the special light conditions, i.e.…”
Section: Measurement Resultssupporting
confidence: 81%
“…Fabry-Pérot microcavities consist of two semitransparent mirrors (quality factor, Q = 98) with an optical path length allowing resonances in the visible spectral range. For analysis in the microcavity, the cyanobacteria were embedded in a BG-11 agarose matrix to restrict spatial drift [9]. In the set-up, the cyanobacteria located in the microcavity were irradiated with 440 nm laser light from below and the residual fluorescence recorded through a high-NA objective lens (NA = 1.4) (see Fig.…”
Section: Measurement Resultsmentioning
confidence: 99%
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