Modeling and scaling of chielectric relaxation of nonlinear optical polymers in frequency domain

Abstract

chielectric relaxation theory was demonstrated. chielectric relaxation that selectively probes chromophore reorientation in the frequency domain was described by the Havriliak Negami (HN) function. chielectric spectra of several nonlinear optical (NLO) polymers were fitted well by the HN function. To describe the scaling of chromophore reorientation relaxation in frequency domain, two-shape parameters m and n describing the low- and high- frequency wings of the chielectric spectra need to be specified, besides the chielectric characteristic relaxation time τ and the chielectric strength Δχ(2). From the temperature dependences of m and n of NLO polymers, the relations between the chromophore relaxation and the α relaxation of the polymer host have been revealed.