SOL-GEL PROCESSED CONJUGATED POLYMERS FOR OPTICAL WAVE-GUIDES

Novel sol-gel processed poly(1,4-phenylene vinylene) (PPV) and poly(2,5-disubstituted-1,4-phenylene vinylene)/silica composites were prepared by a soluble precursor technique. The two PPV derivatives included in this study were poly(2-bromo-5-methoxy-1,4-phenylene vinylene) and poly(2-butoxy-5-methoxy-1,4-phenylene vinylene). The spectral characteristics of these materials have been investigated using UV-visible and FT-IR spectroscopy. The densification process was studied by differential scanning calorimetry and thermal gravimetric analyzer. The third-order nonlinear susceptibility chi(3) have been investigated for the polymers themselves and their sol-gel composites at 602nm using degenerate four-wave mixing (DFWM) technique. Relatively large chi(3) values (4 x 10(-10) is similar to 1 x 10(-9) esu) with a subpicosecond response were observed.