偶氮掺杂聚合物旋涂膜的全光极化特性研究

寻找一种具有快的二次谐波产生(SHG)的偶氮掺杂聚合物和合适的极化条件是目前多数研究的重点。用全光极化的方法研究了主客体掺杂偶氮染料旋涂膜二次谐波产生的特性。实验结果表明:对硝基苯偶氮甲苯二酚(NBMR)掺杂到聚甲基丙烯酸甲酯(PMMA)和聚醋酸乙烯酯(PA)两种不同的聚合物旋涂膜中,相同的膜厚全光极化时二次谐波信号达到饱和所需的极化时间不同,主体是聚甲基丙烯酸甲酯的比聚醋酸乙烯酯的约快15 min。对于同一样品,极化条件光强比为9比为30要好。对于同一主体(聚甲基丙烯酸甲酯)不同客体不同膜厚的旋涂膜,二者的二次谐波信号随极化时间的变化规律基本相同:随着极化时间的增加信号增大,而增大到一定程度样品的二次谐波信号达到饱和,信号不再增加,随着极化时间的进一步增加信号反而有所减弱,最后趋于稳定的状态。

Research on Peculiarity of All-Optical Poling for the Azo Adulterant Polymer Spin Film

It has been an important trend for searching materials with quicker second harmonic generation (SHG) and some excellent poling conditions. In this paper, the properties of SHG were investigated for spin coating films of the Azo host-guest adulterant dye by using all-optical poling way. The experiment results show that the saturation time of all optical poling was different for the same guest (NBMR) adulterated to different hosts. The poling time of whose hostis PMMA was about 15 min quicker than PA. For the same sample, poling condition Iω/I2ω=9 is better than Iω/I2ω=30. The rule of all-optical poling were basically same for the spin coating films with the same host (PMMA), different guests (NBAR and NBMR) and different thicknesses. The longer of the poling time, the stronger of the SHG intensity during the poling first stageis . But the SHG intensity no longer increases adding when the samples′ SHG intensity reaches a certain saturation value. Then it would be slightly receded with the increasing of poling time, and at last it would reach to a stable value.