Third-order nonlinear optical figure of merits for conjugated TTF-quinone molecules.
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.
Fuks-Janczarek
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I
Laboratoire POMA, UFR Science, UMR CNRS 6136, Université d'Angers. 2, Boulevard, Lavoisier 49045, Angers, France.
Luc
J
J
Sahraoui
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B
Dumur
F
F
Hudhomme
P
P
Berdowski
J
J
Kityk
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IV