偶氮聚合物薄膜的全光极化研究

Research of all-optical poling of azobenzene polymer films

报告了分散红共聚物膜HMMM DR1,HMMM DR19 和偶氮侧链聚合物膜PCN6 和PCN2 的合成和制备, 并以HMMM DR1和PCN6 为代表比较研究了这两种具有不同吸收性质材料的全光极化特性,研究了他们的实时极化和弛豫过程,对他们的全光极化性质作了最基本的表征。研究了倍频光吸收对薄膜光极化效率的影响,讨论了偶氮聚合物材料光诱导二阶非线性极化率的效率和倍频光透射率之间的折衷关系,这对实用化的全光器件的研制是至关重要的。实验确证了在PCN6 薄膜中实现了准相位匹配。对厚膜中光诱导二阶非线性极化率的弛豫抑制效应作出解释。

Two kinds of azobenzene polymers （including four samples., films of HMMM-DR1, HMMM-DR19 and films of side-chain azobenzene polymers PCN6 and PCN2） were synthesized and prepared. The HMMM-DR1 and PCN6 were studied and compared with all-optical poling （AOP） technique. Their poling and decaying process were studied and the fundamental AOP properties were described. Double frequency absorption dependence of AOP efficiency of thin films and the trade-off relationship between efficiency of photo-induced second order polarizability of the azobenzene and the transmission efficiency of double frequency were investigated, which are critically important to practical all-optical devices. The quasi-phase matching in the thin film PCN6 was proved and relaxation retardation effect of photo-induced second order polarizability in thick films was interpreted.