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- W2023384149 abstract "The interaction of dyes and metallic nanostructures strongly affects the fluorescence and can lead to significant fluorescence enhancement at plasmonic hot spots, but also to quenching. Here we present a method to distinguish the individual contributions to the changes of the excitation, radiative and non-radiative rate and use this information to determine the quantum yields for single molecules. The method is validated by precisely placing single fluorescent dyes with respect to gold nanoparticles as well as with respect to the excitation polarization using DNA origami nanostructures. Following validation, measurements in zeromode waveguides reveal that suppression of the radiative rate and enhancement of the non-radiative rate lead to a reduced quantum yield. Because the method exploits the intrinsic blinking of dyes, it can generally be applied to fluorescence measurements in arbitrary nanophotonic environments. Metal nanostructures strongly influence fluorescence of nearby molecules, ranging from significant enhancement to total quenching. To decode the precise interactions taking place, Holzmeister et al. present a method that distinguishes the contributions to excitation, radiative and non-radiative rates." @default.
- W2023384149 created "2016-06-24" @default.
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- W2023384149 date "2014-11-05" @default.
- W2023384149 modified "2023-10-16" @default.
- W2023384149 title "Quantum yield and excitation rate of single molecules close to metallic nanostructures" @default.
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- W2023384149 doi "https://doi.org/10.1038/ncomms6356" @default.
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