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Manipulation optique de l'organisation de chromophores non-linéaires et luminescents

Abstract : Polymer thin films doped with nonlinear and luminescent chromophores were poled by an all-optical process based on the interference of multiphoton absorption pathways. This holographic technique enabled us to imprint locally controlled nonlinear and luminescence anisotropies in organic materials by governing the photoinduced molecular distribution through the polarization state of the exciting laser beams. The symmetry and the dynamics of the odd and even order parameters of the induced distribution were studied theoretically and experimentally using an irreducible spherical tensor-based formalism jointly applied to the molecular polarizabilities and field tensors. Excitation transfer processes between neighboring molecules were demonstrated and analyzed. The nonlinear polarization responses of poled assemblies of octupolar organometallic molecules were discussed using a valence bond-charge transfer model describing the molecular polarisability tensors. This research leads to interesting perspectives in the field of nonlinear holographic storage, which is experimentally demonstrated at the microscopic scale in this work.
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https://tel.archives-ouvertes.fr/tel-00008635
Contributor : Sébastien Bidault <>
Submitted on : Wednesday, March 2, 2005 - 4:19:17 PM
Last modification on : Monday, February 15, 2021 - 10:37:29 AM
Long-term archiving on: : Friday, April 2, 2010 - 9:18:48 PM

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  • HAL Id : tel-00008635, version 1

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Sébastien Bidault. Manipulation optique de l'organisation de chromophores non-linéaires et luminescents. Physique Atomique [physics.atom-ph]. École normale supérieure de Cachan - ENS Cachan, 2004. Français. ⟨tel-00008635⟩

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