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29 November 2000 Material optimization for electro-optic modulation and cascading
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A large effort has been devoted to the preparation of organic polymeric materials for electro-optic modulation and more recently for cascading based processes. These materials contain push-pull chromophores either incorporated as guest in a high Tg polymeric matrix (doped polymers) or grafted onto the polymeric matrix. These systems present several advantages but require significant improvement at the molecular level- by designing optimized chromophores with very large molecular figure of merit specific to each application targeted. The sol-gel route was used to prepare hybrid organic-inorganic materials, for the fabrication of amorphous solids of various shapes (bulk, think films...). The results obtained on optimized chromophore-doped poled thin films emphasize that intermolecular interactions have to be taken into account, as already pointed out by Dalton and coworkers. By combining a molecular engineering strategy for getting large molecular figure of merit and by controlling the intermolecular dipole-dipole interactions via both tuning the push-pull chromophore concentration and the incorporation screening carbazole moieties in high concentration. This strategy allows us to obtain a r33 of about 50 pm/V at 831 nm for a new optimized chromophore structure. In parallel, these thin films are being processed to be used as passive components for integrated optics.
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Jorge Reyes, Bruno Darracq, Michael Canva, Mireille H. Blanchard-Desce, Frederic Chaput, Khalid Lahlil, Jean-Pierre Boilot, Alain Brun, and Yves Levy "Material optimization for electro-optic modulation and cascading", Proc. SPIE 4106, Linear, Nonlinear, and Power-Limiting Organics, (29 November 2000);

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