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In the framework of this thesis, new UV-patternable organic-inorganic hybrid polymers with higher refractive indices than reported in the literature for photonic applications were developed and studied with respect to their chemical structure, their optical properties, and their ability of being patterned by 1PP and 2PP. Particularly with 2PP, one could create 3D structures using the novel hybrid materials. The materials were prepared from hydrolysis and polycondensation reactions of · organo-alkoxysilanes and titanium alkoxide precursors, modified with and without CL and organo-alkoxysilanes precursors, and · organo-alkoxysilanes, titanium alkoxide and organophosphorus precursors. The major scope of this work was to increase the refractive index of ORMCER® materials based on only organo-alkoxysilanes. Thus, the parameters which influence the refractive index were investigated thoroughly. In particular, the synthesis parameters such as the introduction of titanium alkoxide and its concentration, the organo-alkoxysilanes, the catalyst concentration, the solvent used, but, also the processing parameters such as, the UV exposure dose, initiator concentration, and developer were investigated.