title: Reduced dimensionality in organic electro-optic materials: theory and defined order.
abstract: Identification of electronic intermolecular electrostatic interactions that can significantly enhance poling-induced order is important to the advancement of the field of organic electro-optics. Here, we demonstrate an example of such improvement achieved through exploitation of the interaction of coumarin pendant groups in chromophore-containing macromolecules. Acentric order enhancement is explained in terms of lattice-symmetry effects, where constraint of orientational degrees of freedom alters the relationship between centrosymmetric and acentric order. We demonstrate both experimentally and theoretically that lattice dimensionality can be defined using the relationship between centrosymmetric order and acentric order. Experimentally: Acentric order is determined by attenuated total reflection measurement of electro-optic activity coupled with hyper-Rayleigh scattering measurement of molecular first hyperpolarizability, and centrosymmetric order is determined by the variable angle polarization referenced absorption spectroscopy method. Theoretically: Order is determined from statistical mechanical models that predict the properties of soft condensed matter.
authors: Department of Chemistry, University of Washington, Seattle, Washington 98195, USA.
authors: Stephanie J
authors: SJ
authors: Benight
authors: Lewis E
authors: LE
authors: Johnson
authors: Robin
authors: R
authors: Barnes
authors: Benjamin C
authors: BC
authors: Olbricht
authors: Denise H
authors: DH
authors: Bale
authors: Philip J
authors: PJ
authors: Reid
authors: Bruce E
authors: BE
authors: Eichinger
authors: Larry R
authors: LR
authors: Dalton
authors: Philip A
authors: PA
authors: Sullivan
authors: Bruce H
authors: BH
authors: Robinson