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Croissance par ablation laser de films minces d'oxyde pour la réalisation de structures optiquement guidantes

Abstract : Our general thought process (démarche de la pensée) is in keeping with the general pattern of the realization of optical waveguiding thin films for integrated optoelectronic applications. The matérial of choice is lead titanate PbTiO3 (PT). This compound is widely studied and well known for its ferroelectric properties, but it has not been used yet in optical devices for which the reference material is lithium niobate LiNbO3. Nevertheless, the non linear optical coefficients of PT are promising for the generation of a blue light source from laser diodes which emit at 980 nm. If the second harmonic generation is well known and mastered for bulk materials, the transposition in thin films is still difficult. In this study, lead titanate thin films were grown by pulsed-laser deposition (PLD). The growth conditions on (100)MgO substrate were optimized such as substrate temperature, oxygen pressure ou laser fluence to grow oriented and epitaxial thin films with excellent structural properties and surface roughness. The waguiding properties studied by m-lines spectroscopy indicate that optical characteritics (refractive indices) of thin films are the same as the bulk's ones. The optical losses measured at 632,8 nm are lower than 1 dB/cm, which constitute the best results obtained up to now on this kind of system (PbTiO3/Substrate). Future prospects for the realization of optical waguiding structures for the generation of blue light by quasi phase matching (QPM) in integrated devices PT/MgO/Si could be considered but it requires the realization of periodic poled thin films with a resolution that actual technology couldn't realize at this time.
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Submitted on : Thursday, March 29, 2018 - 12:36:12 PM
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  • HAL Id : tel-01750026, version 1



Anne Roemer. Croissance par ablation laser de films minces d'oxyde pour la réalisation de structures optiquement guidantes. Autre. Université Paul Verlaine - Metz, 2004. Français. ⟨NNT : 2004METZ037S⟩. ⟨tel-01750026⟩



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