The long-term orientational stabilization of nonlinear optical (NLO) chromophores which have been preferentially aligned within a polymeric medium by electric field poling represents a crucial test of the extent to which polymer relaxation/physical aging can be controlled chemically and is of paramount importance to the development of efficient polymer-based second-order NLO materials.1 We recently reported2 an effective approach to chromophore immobilization which utilizes electricfield-induced alignment of high-βvec chromophores dispersed within a two-component epoxy matrix3 which is concurrently subjected to thermal cross-linking.4 The chromophores are found to exhibit higher levels of orientational stability within the cross-linked matrix, as evidenced by significantly improved second harmonic generation (SHG) temporal stability. Nevertheless, the SHG efficiency of such guest-host systems is severely limited by the low chromophore number densities and still less than optimum chromophore immobilizations which are practicable.2, 5 We communicate here the synthesis and implementation of a second generation epoxy-based NLO chromophore system in which a reactive high-βvec chromophore serves as both the NLO-active component and as the diamine cross-linking agent of the matrix (Scheme I). We also demonstrate that the SHG temporal stability of such materials can be enhanced significantly by employing an oligomeric epoxide reagent.
No takes yet. Share an insight, caveat, or question.
Hubbard et al. (1992) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: