Abstract
There are two components to the intermolecular electronic dipole-dipole interaction of charge transfer chromophores. One component favors centrosymmetric order while the other favors noncentrosymmetric order. The equilibrium minimum energy lattice that is assumed will depend upon how other interactions (nuclear repulsive or steric, covalent bond restrictions, Van der Waals interactions) affect the competition of these two components of the dipole-dipole interaction. We demonstrate how the construction of doped single- and multi-chromophore-containing dendrimer organic glasses can be used to enhance electric field poling-induced noncentrosymmetric order giving rise to electro-optic coefficients greater than 300 pm/V. Pseudo-atomistic Monte Carlo calculations are used to reproduce the experimentally-observed increase in acentric order parameter with chromophore concentration. The resulting organic glasses can be viewed as intermediate between acentric organic crystals and poled polymer composite materials.
© 2005 Optical Society of America
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