Generally, a second order NLO polymer is composed of polymer chains and chromophore moieties; the latter of which possesses an asymmetric pull-push electronic structure (Fig. 1b), which contributes to its dipole moment (μ) and hyperpolarizability (β).
![[This page as RDF]](http://data.gesis.org/somesci/static/rdf-icon.gif){kind=icon}