Second-Order Nonlinear Optical Activity Induced by Ordered Bipolar Chromophores Confined in the Pores of an Anionic Metal-Organic Framework

摘要

Organic second-order nonlinear optical (NLO) materials have potential applications in high-speed electro-optic modulators and all-optical data processing devices. Thus these materials have attracted considerate attention over the past decade. Among the prerequisites such as large chromo-phore hyperpolarizability (β), chromophore number density, and efficient acentric molecular ordering, efficient ordering is the most crucial while most challenging task for achieving large bulk second-order NLO responses. Although a variety of organic chromophores with high β values have been developed for a long time, so far no powerful strategy has been realized to induce efficient acentric molecular ordering, and thus the use of these organic chromophores as nonlinear optical materials is limited. The developed strategies for inducing noncentrosymmetric arrangements of dipolar chromophores which include electric-field poling and self-assembly suffer from intermolecular dipole-dipole interactions among the packed chromophores.