Nonlinear optical properties of aniline oligomers / Propriedades ópticas não-lineares de oligômeros de anilina

AUTOR(ES)

Paulo Licênio Franzen

DATA DE PUBLICAÇÃO

2002

RESUMO

We report on the study of electronic optical non linearities in two aniline oligomers: dimer and the tetramer. Four tetramer concentrations were measured, pure and also 33 and 100% doped; one of dimer non doped another 100% doped. The solutions were prepared using dimethyl sulfoxide (DMSO) as solvent and the doping was performed with hydrochloric acid. The samples were characterized by measurements of linear absorption and fluorescence. We obtained the values of the first hyperpolarizability (?) for all samples, the non linear index of refraction (n2) for non doped and doped tetramer, and the non linear absorption in function of intensity and concentration of the tetramer. The measurements were accomplished through the techniques of Z-Scan, non linear absorption and Hyper-Rayleigh Scattering. The results were interpreted in terms of the comparison among different doping states and of the variation of cross-section for the transition from ground to the first excited states.

ASSUNTO(S)

absorção não linear oligômeros de anilina hiperpolarizabilidades aniline oligomers nonlinear absorption refração não linerar hiperpolarizabilities espalhamento hiper-rayleigh hyper-rayleigh scatering z-scan nonlinear refraction excited state dynamics fluorescent decay time dinâmica de estado exitado varredura-z fluorescência

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