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《Chinese Journal of Luminescence》 2001-03
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Fabrication of Ormocer Films Containing Azo dye Molecules and Their Optical Second Order Nonlinearities

XIA Hai ping, ZHANG Jian li, CHEN Hong bing, ZHANG Xin min, WANG Jin hao, NIE Qiu hua (Laboratory of Photo electronic Materials, Ningbo University, Ningbo 315211, China)  
Using 3 aminopropyltriethoxysilane(KH550) and 3 glycidoxypropltrimethoxy silane(KH560) as precursors, Disperse Orange 3 (DO3) was doped into above sol and ormocer in 3wt% concentration, and the sol gel derived films with 4μm thickness coated on ITO film were fabricated. Corona poling was performed by applying a high voltage of +5kV to a needle electrode. After corona poling of the film at 185° for 4 hours, about 1/5 of DO3 molecules remained in solid state film, estimating from their spectra, and the concentration of DO3 molecule in poled film was estimated about 1 6×10 19 cm -3 . Second harmonic generation (SHG) was used to probe the size and stability of the orientational order of the poled films. The second harmonic intensity of the films was measured using p (parallel polarized) excitation and p detection, and compared with that generated by a y cut quartz crystal. No Maker fringe pattern for the film was observed , we could assume that the coherence length was much larger than the film thickness. The SHG intensity increases with increasing angle and reaches to maximum at θ =52°. The effective second order nonlinear coefficient, d eff and d 33 were estimated about 0 11pm/V and 0 14pm/V, respectively, and the intensity of SHG decreased slightly and remained ~80% of the initial value even after poling 500 hours. It is thought that for a combination of DO3 and organic inorganic gel the pore shrinkage and high baking temperature stabilize the nonlinearity in particular. Furthermore, due to leading KH550 (containing -NH 2 group) into sol gel derived matrix, it is expected that the hydrogen bonds between DO3 and KH550 in matrix are formed and the more density of matrix is reached, which can keep the oriented DO3 stable.
【Fund】: 宁波市重点实验室基金资助课题 ( 992 30 2F);; 国家教委留学回国基金资助课题 ( 0 0 36 0 1G)
【CateGory Index】: O484.1;O484.4
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