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Composants nanostructurés pour le filtrage spectral à l’échelle du pixel dans le domaine infrarouge

Abstract : Spectral analysis of an infrared scene allows for a better identification of its components. Nanotechnologies offer new opportunities to achieve spectral filtering thanks to optical resonances. In this thesis, I use sub-wavelength gratings to achieve spectral filtering on areas as small as a pixel. I focused on the study of guided-mode resonance filters, made of a coupling grating and a thin dielectric layer acting as a waveguide. This structure typically needs large surfaces to filter infrared light. However, I proposed two possible modifications of this structure: either using a resonant cavity or using metallic gratings.Numerical analysis of the optical response of structures with a metallic grating showed that the spatial extension of the electromagnetic field is limited at the resonant wavelength. Thanks to this short extension, I is possible to achieve filtering with only 30 µm-long guided-mode resonance filters. I also fabricated and characterized those pixel-sized filters.Finally, I studied mosaics of small guided-mode resonance filters. I showed that the dimensions, the resonant transmissions and the angular acceptance of those mosaics are compatible with using them inside multi-spectral cameras. I also showed a sample architecture for an infrared multispectral-camera using a mosaics of guided-mode resonance filters.
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Antoine Bierret. Composants nanostructurés pour le filtrage spectral à l’échelle du pixel dans le domaine infrarouge. Optique [physics.optics]. Université Paris Saclay (COmUE), 2017. Français. ⟨NNT : 2017SACLX085⟩. ⟨tel-01707601⟩

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