Third order nonlinear optical susceptibility of fluorescein-containing polymers determined by electro-absorption spectroscopy

Novel polymers containing xanthene groups with high dye concentrations were prepared, and their third order nonlinear optical properties were studied by electroabsorption spectroscopy technique. The polymers were amorphous with refractive indices above 1.6 in the non-resonant region. The UV-Visible absorption spectra indicate the fluoresceins molecules in the polymers are H-aggregated. They showed third order nonlinear susceptibility, chi((3)) (-omega:omega,0,0), of 2.5-3.5 x 10(-12) esu. (C) 2011 Elsevier B.V. All rights reserved.