Pyroelectrical investigation of the dipole orientation in nonlinear optical polymers during and after photoinduced poling

摘要: Several of the chromophore molecules considered for use in nonlinear optical polymers exhibit photoisomerization. This photoinduced transformation from one isomer to another changes shape dipolar molecule and thus often enhances its mobility within a polymer matrix. Consequently, molecular dipoles can sometimes be oriented by means an electric field even well below glass transition temperature if photoisomerization exploited. effect forms basis poling which was investigated detail also used preparation patterns with inverted dipole orientations along thickness direction film. By pyroelectrical measurements, process examined situ resulting nonuniform orientation profiles were probed. From combination thermal analysis thermally stimulated depolarization, complete description relaxation behavior samples after obtained.