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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Effect of chromophore-chromophore electrostatic interactions in the NLO response of functionalized organic-inorganic sol-gel materials
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Effect of chromophore-chromophore electrostatic interactions in the NLO response of functionalized organic-inorganic sol-gel materials

机译：发色团-发色团静电相互作用对功能化有机-无机溶胶-凝胶材料NLO反应的影响

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摘要

In the last years, important non-linear optical (NLO) results on sol-gel and polymeric materials have been reported, with values comparable to those found in crystals. These new materials contain push-pull chromophores either incorporated as guest in a high T_(g) polymeric matrix (doped polymers) or grafted onto the polymeric matrix. These systems present several advantages, however they require significant improvement at the molecular level—by designing optimized chromophores with very large molecular figure of merit, specific to each application targeted. Besides, it was recently stated in polymers that the chromophore-chromophore electrostatic interactions, which are dependent of chromophore concentration, have a strong effect into their NLO properties. This has not been explored at all in sol-gel systems. In this work, the sol-gel route was used to prepare hybrid organic-inorganic thin films with different NLO chromophores grafted into the skeleton matrix. Combining a molecular engineering strategy for getting a larger molecular figure of merit and by controlling the intermolecular dipole-dipole interactions through both: the tuning of the push-pull chromophore concentration and the control of tetraethoxysilane concentration, we have obtained a r_(33) coefficient around 15 pm/V at 633 nm for the classical DRI azo-chromophore and a r_(33) around 50 pm/V at 831 nm for a new optimized chromophore structure.
机译：近年来，已经报道了在溶胶-凝胶和聚合物材料上的重要非线性光学（NLO）结果，其值可与晶体中发现的值相媲美。这些新材料包含推挽生色团，它们既可以作为客体掺入高T_（g）聚合物基质（掺杂的聚合物）中，也可以接枝到聚合物基质上。这些系统具有几个优点，但是它们需要在分子水平上进行显着改进-通过设计具有非常大的分子品质因数的优化发色团，具体针对每种目标应用。此外，最近在聚合物中指出，依赖于发色团浓度的发色团-发色团静电相互作用对其NLO性质具有强烈影响。在溶胶-凝胶体系中根本没有对此进行探索。在这项工作中，溶胶-凝胶法被用于制备有机-无机杂化薄膜，其中不同的NLO发色团被接枝到骨架基质中。结合分子工程策略以获取更大的分子质量因数，并通过控制分子间偶极-偶极相互作用，包括推挽生色团浓度的调节和四乙氧基硅烷浓度的控制，我们获得了r_（33）系数对于传统的DRI偶氮发色团，在633 nm处约为15 pm / V;对于新的优化发色团结构，在831 nm处，r_（33）在50 pm / V附近。

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