Evidence for exceptionally high dipole moments in a series of nonlinear optical chromophores doped into poly(methyl methacrylate) films has been found. The strength of the poling field/dipole interaction is measured directly from incidence angle dependence of the second harmonic (SH) intensity generated from corona poled films. Values of the dipolar orientation parameter, (cos θ), greater than 0.5 can be achieved for externally applied fields of only 50 MV m-1. Quantum chemical calculations of the evolution of the dipole moments of the compounds versus local reaction field support the conclusion that extremely high dipole moments characterise these molecules.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry