Étude expérimentale de la fluorescence et du transfert non-radiatif en champ proche de nanostructures métalliques

Abstract : Light-matter interaction strongly depends on the environment of the fluorescent emitter. It is governed by a fundamental physical quantity: the local density of electromagnetic states (LDOS), which is proportional to the decay rate of the fluorescent emitter in a given environment.The main part of this experimental thesis is devoted to the spatially resolved study of the decay rate and the fluorescence intensity of a nano-emitter in the near field of plasmonic nanoantennas. This study has been made possible by the use of a near field scanning fluorescence microscope recently developed at Institut Langevin. During this thesis we obtained a substantial improvement of the performances of this device. This allowed us to map the radiative and apparent non-radiative decay rates in the near field of a nanostructure with nanometer spatial resolution.Thereafter, we started to investigate the non-radiative energy transfer between two fluorescent molecules. This phenomenon, known as FRET (Förster Resonance Energy Transfer), usually takes place over distances of the order of several tens of nanometers. Using a plasmon propagating on the surface of a continuous gold film as a vehicle to transfer the energy between the two molecules, we have demonstrated that it is possible to extend the range of FRET on distances greater than one micron. The perspective after the end of this thesis, is the study of the influence of the environment on the efficiency and the range of FRET.
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Da Cao. Étude expérimentale de la fluorescence et du transfert non-radiatif en champ proche de nanostructures métalliques. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066530⟩. ⟨tel-01134425⟩



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