A new Diels-Alder Adduct of C60 with 1,1’-biindene (CB) has been synthesized. The Langmuir trough study of this new fullerene derivative indicates that floating film could form monomolecular thick film at the air/water interface at lower concentration, and can be well transferred the floating mixed CB and arachidic acid film onto substrates using the Langmuir-Blodgett (LB) technique. In the case of the mixed film, high quality films with thickness of up to 50 layers could be readily built up. The absorption variation with film thickness at 255nm was measured, indicating good LB deposition up to 50 layers.
A kind of hybrid material was synthesized via sol-gel process with PMMA and TEOS as reactants, and 4’-Iodo-4-dimethylaminoazobenzene (IDMA) as nonlinear optical organic chromophore. The second order nonlinear optical properties of hybrid material in thin films were investigated by using All-optical poling technique, and the influences of films thickness, structure and poling temperature on SHG properties were discussed. The experimental results indicated that the absorption spectrum of PMMA/SiO2/IDMA film was wider than the spectrum of PMMA/IDMA film. As a consequence of the experiment, we found that different thickness films had different SHG saturation values, there was an optimum thickness for the films. In addition, the higher the sample temperature is, the smaller the SHG intensity is. We also found that the existence of SiO2 network in the film significantly improved the azo orientation stability.
The poling conditions were studied in AOP process by second harmonic generation (SHG) for host-guest adulterant thin-films. The guest was 4’-Nitro-4-dimethylaminoazobenzene and host was PMMA. The experimental results showed that the optimal poling temperature was about room temperature, the optimal ratio of light intensity of fundamental signal (ω) and its second harmonic signal (2ω) during AOP was approximately 100, the thin films had the same rule that the saturated value of SHG depended on the ratio. In addition, we obtained a suitable thickness around 2200nm that the stronger SHG after poling was generated.
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