Stable Second-Order Nonlinear Optical Epoxy-Based Polymer. (Reannouncement withNew Availability Information)

摘要

An epoxy-based polymer incorporating 4-(4'-nitrophenylazo) phenylamine has beensynthesized and subsequently functionalized with cinnamoyl groups. This material can be easily solution-processed into thin films by spin coating and it exhibits large second-order nonlinear optical (NLO) effects after poling. In a poled sample, the second harmonic generation coefficient, d(sub 33) of 47 pm V(exp-1) was measured at 1.06 micrometers. Crosslinking is brought about using ultra-violet radiation at 254 nm. In a poled and crosslinked film, the measured value of d(sub 33) is 31 pm V(exp-1). This d(sub 33) value is less than that of the poled and uncrosslinked sample, perhaps due to photo-induced trans-cis isomerization and partial degradation and realignment of the NLO chromophores during the photocrosslinking process. Nevertheless, the poled and crosslinked films shows a much more stable second order response at ambient condition compared with the poled and uncrosslinked one. Waveguide loss and photoconductivity of this material were also measured.... Epoxy-based polymer, Second harmonic generation, Photocrosslinking, Waveguide.