INGENIERIE MOLECULAIRE POUR L'OPTIMISATION DES EFFETS LIES A L'ABSORPTION A DEUX PHOTONS DANS LE VISIBLE

LYON-ENS Sciences (693872304) / SudocSudocFranceF

Large Two-Photon Absorption Properties of Polyphenyls and Polyfluorenes

International audienceThe theoretical study of two-photon absorption (TPA) properties of polyphenyls and polyfluorenes (with the number of phenyl rings N =2 to 6) was related to cooperative effects between monomers. These effects lead to an increase of the TPA cross-section with N without saturation according to a power law

One- and two-photon picosecond excitation dynamics of the singlet states of a tetraphenyl-diamine derivative in solution

International audienceWe report on nonlinear absorption measurements of a tetraphenyl-diamine dye which was developed to be used as a transparent two-photon-type molecular material for optical limiting applications in the visible range. The excited state properties which are relevant to the process are investigated experimentally using picosecond nonlinear optical Kerr ellipsometry for differential absorption cross section monitoring. Results of the picosecond one- and two-photon absorption dynamics are presented. Time-resolved excited state absorption properties are discussed in terms of the optical limiting application