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Controlling three-color Förster resonance energy transfer in an optical Fabry–Pérot microcavity at low mode order

  • We study three-color Förster resonance energy transfer (triple FRET) between three spectrally distinct fluorescent dyes, a donor and two acceptors, which are embedded in a single polystyrene nanosphere. The presence of triple FRET energy transfer is confirmed by selective acceptor photobleaching. We show that the fluorescence lifetimes of the three dyes are selectively controlled using the Purcell effect by modulating the radiative rates and relative fluorescence intensities when the nanospheres are embedded in an optical Fabry–Pérot microcavity. The strongest fluorescence intensity enhancement for the second acceptor can be observed as a signature of the FRET process by tuning the microcavity mode to suppress the intermediate dye emission and transfer more energy from donor to the second acceptor. Additionally, we show that the triple FRET process can be modeled by coupled rate equations, which allow to estimate the energy transfer rates between donor and acceptors. This fundamental study has the potential to extend the classical FRET approach for investigating complex systems, e.g., optical energy switching, photovoltaic devices, light-harvesting systems, or in general interactions between more than two constituents.

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Author of HS ReutlingenWackenhut, Frank; Brecht, Marc
Erschienen in:The Journal of Physical Chemistry C: Energy, Materials, and Catalysis
Publisher:American Chemical Society
Place of publication:Washington, DC
Document Type:Journal article
Publication year:2023
Tag:fluorescence; fluorescence resonance energy transfer
cavities; energy transfer; nanospheres
Page Number:8
First Page:12152
Last Page:12159
PPN:Im Katalog der Hochschule Reutlingen ansehen
DDC classes:540 Chemie
Open access?:Nein
Licence (German):License Logo  In Copyright - Urheberrechtlich geschützt