Plasmon-mediated energy transfer and super-resolution imaging in the near field of nanostructured materials

Abstract : In this thesis, we perform experimental measurements and data modelling to investigate spontaneous emission of fluorescent emitters in nanostructured environments. The manuscript is organised into two main parts.In the first part, we study micrometre-range energy transfer between fluorescent emitters in plasmonic environments. First of all, we characterise plasmon-mediated energy transfer between ensembles of fluorescent emitters located in the near field of a silver film. We thus determine the distance dependence of the energy transfer rate over micrometre distances. We then couple a single quantum dot and a fluorescent nanobead to a silver nanowire and we study evidences of the energy transfer between the two emitters, separated by several micrometres. We notably demonstrate a correlated blinking of the two emitters through the study of the correlation function of their fluorescence intensity.In the second part, we probe sub-wavelength spatial variations of the local density of electromagnetic states induced by nanostructured environments by means of different super-resolution microscopy techniques. To start with, we perform a three-dimensional study of the near-field interaction between a fluorescent nanobead and different silicon nanoantennas using a scanning-probe microscope. We then introduce a stochastic technique to experimentally determine the position and the fluorescence decay rate of single photo-activated molecules, with a localisation precision of the order of 10 nm. Finally, we use the Fisher information to estimate lower bounds on the standard errors on position and decay rate estimates performed in the context of single-molecule microscopy.
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Dorian Bouchet. Plasmon-mediated energy transfer and super-resolution imaging in the near field of nanostructured materials. Physics [physics]. PSL Research University, 2017. English. ⟨NNT : 2017PSLET026⟩. ⟨tel-01862808⟩

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