Nanoparticle assisted control of dye molecules in polydopamine emission via strong optical coupling
A. Gritchenko,1,2 B. Khlebtsov,3 P. Melentiev,1,2, V. Balykin1,2
1Institute of Spectroscopy RAS, Moscow 108840, Russia;
2Higher School of Economics, National Research University, Moscow 101000, Russia
3Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, 13 Prospekt Entuziastov, Saratov 410049, Russia
Abstract
Polydopamine (PDA) is one of the promising materials in modern nanotechnology, which has recordly high adhesion, chemical stability, high oxidation ability and biocompatibility. However, PDA has been found to be a fluorescence quencher by Foerster resonance energy transfer and/or photoinduced electron transfer mechanisms, which may affect the fluorescence intensity of the attached dye molecules. In this work, we show that quenching effect can be significantly suppressed by the formation of a strong coupling of the dye molecules in the PDA shell grown around the plasmonic nanoparticle. In this case, the energy exchange between the dye molecules and the plasmonic nanoparticle occurs at times much faster than the characteristic times of quenching of the dye molecules in the PDA material alone (without plasmonic nanoparticle). This makes it possible to attenuate the quenching process of the dye molecules in the PDA shell by about 1000-fold when the strong coupling regime is reached. Moreover, we show that the implementation of strong optical coupling in such a system makes it possible to achieve a 30-fold reduction in the photodegradation process of the dye molecules, which is a fundamental limitation in the use of dye molecules in nanophotonics and optical sensing.
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Speaker
Anton Gritchenko
National Research University Higher School of Economics
Russia
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