3D microscopy by holographic localization of Brownian metallic nanoparticles

Ariadna Martinez Marrades 1
1 POM - Physique des Ondes pour la Médecine et la Biologie
INSERM - Institut National de la Santé et de la Recherche Médicale : U979, Institut Langevin ondes et images
Abstract : In this thesis work, we present a novel stochastic microscopy technique based on Digital Holography for the 3D mapping of optical intensity distributions. We show that this far-field, wide-field, 3D microscopy can be turned into both a superresolution and a near-field imaging technique. To do so, we use metallic nanoparticles undergoing Brownian motion as stochastic local field probes that we localize in three-dimensions in order to overcome the diffraction limit. The random motion of the particles allows for a complete exploration of the sample. Beyond simple localization, the gold markers can actually be envisaged as extremely local electromagnetic field probes, able to scatter light into the far-field. The technique we propose here is therefore a combination of the concepts of superlocalization and NSOM microscopies. The possibilities of the technique are illustrated through the 3D optical mapping of an evanescent and a propagative wave. Fast computation methods allow us to localize hundreds of particles per minute with accuracies as good as 3×3×10 nm3 for immobilized particles. In addition to optical intensity mapping, we show a particular application in electrochemistry, by coupling our high resolution images with electrochemical oxidation measurements on silver nanoparticles in solution at the vicinity of an electrode. Our results pave the way for a new subwavelength imaging technique, well adapted to optical characterization in water-based systems (such as in emerging microfluidics studies), which are mostly inaccessible to electron microscopy or local probe microscopies.
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Ariadna Martinez Marrades. 3D microscopy by holographic localization of Brownian metallic nanoparticles. Optics [physics.optics]. Université Pierre et Marie Curie - Paris VI, 2015. English. ⟨NNT : 2015PA066018⟩. ⟨tel-01173962⟩



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