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Transmission exaltée à travers des tamis à photons à ouvertures annulaires nanométriques : simulations et caractérisation

Abstract : Extraordinary optical transmission through optically thick metallic films milled by nanometric apertures is receiving a continuously growing attention from the scientific community. This kind of nanostructures offers many applications in nano-photonics, microscopy, fluorescence, SERS, second harmonic generation, lithographyE In this thesis, we propose to enhance the transmission thanks to annular apertures. Indeed, this new geometry allows the excitation of a guided mode inside the cavity. This mode is responsible for a large transmission much higher than the one mediated by surface plasmon resonance. The theoretical study uses a numerical method based on a Finite Difference Time Domain algorithm. It consists in the direct resolution of the Maxwell's equations by discretizing both space and time. The geometrical parameters (inner and outer diameters, period, metal thickness) and the metal nature have been optimized in order to obtain a large transmission in the visible range. Moreover, the electromagnetic field has been calculated inside the cavity and just above the surface to identify the guided mode. Near and far-field experiments have been carried out to characterize this structures. The experimental results are in good agreement with the theoretical predictions. The near-field study exhibits the fundamental role of the TE11 guided mode in the large transmission. One of the most striking results reported in this work is a transmission in the visible range up to 90% through a silver film engraved with annular nano-apertures. To our knowledge, we demonstrate here for the very first time an extraordinary optical transmission in the visible range with an efficiency as high as 90%.
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Yannick Poujet. Transmission exaltée à travers des tamis à photons à ouvertures annulaires nanométriques : simulations et caractérisation. Sciences de l'ingénieur [physics]. Université de Franche-Comté, 2007. Français. ⟨tel-00373714⟩



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