Fuks-Janczarek I, Luc J, Sahraoui B, Dumur F, Hudhomme P, Berdowski J, Kityk I V
Laboratoire POMA, UFR Science, UMR CNRS 6136, Université d'Angers. 2, Boulevard, Lavoisier 49045, Angers, France.
J Phys Chem B. 2005 May 26;109(20):10179-83. doi: 10.1021/jp0508711.
We have revealed a substantial enhancement of third-order optical figure of merits by the synthesis of a compact molecule possessing the tetrathiafulvalene (TTF) group with two backside C=O groups. Addition of the saturated methylene chain substantially suppresses the third-order optical figure of merits and even local optical hyperpolarizabilities at lambda = 532 nm. Another TTF-derivative molecule possessing ethylenic and acetylenic chains demonstrates large hyperpolarizabilities; however, generally, the figure of merit factor decreases due to the increasing optical losses as a consequence of enhanced linear absorption. At the same time, both of the chromophores have a large nonlinear optical response. General approaches for search and design of the third-order optical materials with improved properties are given.
我们已经揭示，通过合成一种紧凑分子，该分子具有带有两个背面C=O基团的四硫富瓦烯（TTF）基团，三阶光学品质因数得到了显著提高。饱和亚甲基链的加入显著抑制了三阶光学品质因数，甚至在λ = 532 nm时抑制了局部光学超极化率。另一种具有烯链和炔链的TTF衍生物分子表现出较大的超极化率；然而，一般来说，由于线性吸收增强导致光学损耗增加，品质因数降低。同时，这两种发色团都具有较大的非线性光学响应。给出了搜索和设计具有改进性能的三阶光学材料的一般方法。
