New Approach to Design of Cross-Linked Second-Order Nonlinear Optical

摘要

A new class of crosslinked second-order nonlinear optical (NLO) polymers has beendeveloped by processing a NLO-dye and a polymer similar to conventional 'doped polymer' system. Intermolecular crosslinking was carried out by UV radiation subsequent to electric field induced poling of the composite. Cinnamate (C6H5-CH=CH-CO2-) and styrylacrylate (C6H5-CH=CH-CH=CH-CO2-) moieties are selected as the photoreactive chromophores which are attached to both the NLO molecules at two positions and randomly substituted to a vinyl polymer. The poled crosslinked polymers exhibit stable nonlinear activity over a long period of time as characterized by temporal response of second-harmonic generation signal and UV absorption characteristics.