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Proceedings Paper

Enhancement of electro-optic coefficient of doped films through optimization of chromophore environment
Author(s): Michael J. Banach; Max D. Alexander Jr.; Stephen J. Caracci; Richard A. Vaia
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Paper Abstract

Substantial enhancement of the electro-optic (EO) coefficient of NLO films through optimization of host properties and local chromophore environment is discussed. The EO coefficient was determined for common electro-optic chromophores disperse Red 1 (DR1) and 4-(dicyanomethylene)- 2-methyl-6-(4-dimethylaminostryl)-4H-pyran (DCM) doped in poly(styrene) (PS), poly(2-vinyl pyridine) (P2VP), poly(methyl methacrylate((PMMA), poly(cyclohexyl methacrylate), and styrene-methyl methacrylate copolymers. The r33 varied as much as tow orders of magnitude in this series. Resonance enhancement and local field effects account for 20-25 percent of this variation. The remainder is attributed to intermolecular interactions. Electronic and IR spectroscopy revealed the presence of specific secondary interactions between chromophore-host and chromophore- chromophore. These influence the molecular miscibility and thus alter the effective chromophore concentration and therefore the EO coefficient. Additionally, synergy between the chromophore and a field-responsive host facilitates chromophore alignment. A combination of these effects observed in a DR1-P2VP system leads to an enhancement in r33 by greater than 70 percent with respect to a comparable DR1-PMMA system. An ultimate EO coefficient of 15 pm/V for a 25 wt percent DR1-P2VP system was obtained. These results demonstrate the potential associated with modification of guest-host interactions for the development of highly nonlinear, stable EO polymer systems.

Paper Details

Date Published: 18 May 1999
PDF: 10 pages
Proc. SPIE 3623, Organic Photonic Materials and Devices, (18 May 1999); doi: 10.1117/12.348389
Show Author Affiliations
Michael J. Banach, Univ. of Cincinnati (United States)
Max D. Alexander Jr., Univ. of Dayton Research Institute (United States)
Stephen J. Caracci, Air Force Research Lab. (United States)
Richard A. Vaia, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 3623:
Organic Photonic Materials and Devices
Bernard Kippelen, Editor(s)

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