Abstract
Measurements of the electrooptic (EO) properties of polar polymetric films are presented. The polar order is induced by thermopoling using fixed contacts. In doped films, high doping concentrations (20% wt.) have been achieved of the nonlinear organic molecule 2-(N,N-dimethylamino)-5-nitroacetanilide, DAN. The EO coefficients obtained include a contribution from the host polymer in the case of a polycarbonate host where films have EO coefficients higher than those of comparably doped PMMA materials. Among 'side-chain' polymers the authors found that poly(4-vinylpyridine), P-4VP, obtained commercially, also can be poled efficiently and yields moderate EO coefficients. An experimental value for the microscopic nonlinear figure of merit mu beta in P-4VP is calculated and compared with a theoretical value. The resulting mismatch reveals that the simplified thermodynamic model may be inappropriate for this side chain polymer and that low-frequency contributions to the nonlinearity may be significant. >
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