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首页> 外文会议>Organic, Metallo-Organic, and Polymeric Materials for Nonlinear Optical Applications >Push-pull polyenes and carotenoids with enhanced quadratic nonlinear optical susceptibilities
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Push-pull polyenes and carotenoids with enhanced quadratic nonlinear optical susceptibilities

机译：具有增强的二次非线性光学敏感性的推挽多烯和类胡萝卜素

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Abstract: A wide choice of push-pull polyenes and carotenoids of increasing length (up to 30 angstrom) and bearing various donor and acceptor end groups has been synthesized in order to investigate the chain-length dependence of their quadratic hyperpolarizability $beta@. $beta measurements have been performed using the electric field induced second harmonic generation (EFISH) technique. In each series of homologous compounds, the lengthening of the conjugation path results in a pronounced increase in $mu$beta values. This behavior leads to very large static $mu$beta@(0) values for the longest molecules and can be modeled by $mu$beta@(0) $EQ kn$+a$/ relationships with respect to the number n of double bonds in the polyenic chain. The exponent value (a) was found to depend on the end groups. The replacement of a double bond by a triple bond in the middle of the polyenic chain results in a blue shift of the charge transfer absorption band and leads to smaller $mu$beta@(0) values. However, this phenomenon is modulated by the end groups. !29
机译：摘要：为了研究其二次超极化率$ beta @的链长依赖性，已经合成了多种选择的推拉多烯和类胡萝卜素，它们的长度增加（最大30埃）并带有各种供体和受体端基。使用电场感应的二次谐波产生（EFISH）技术进行了$ beta测量。在每个系列的同源化合物中，缀合路径的延长导致μβ值显着增加。此行为导致最长的分子产生非常大的静态$ mu $ beta @（0）值，并且可以通过$ mu $ beta @（0）$ EQ kn $ + a $ /相对于double数n的关系建模多烯链中的键。发现指数值（a）取决于端基。在多烯链的中间用三键代替双键会导致电荷转移吸收带发生蓝移，并导致较小的β（0）值。但是，此现象由端基调节。 ！29

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