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