双羟乙氨基-硝基型偶氮分子的三阶光学非线性  

Third-order optical nonlinearities of novel azo chromophores containing bis(hydroxylethyl) amino-nitro groups

作　　者：钱鹰[1] 肖国民[1] 路志锋[1] 林保平[1] 王刚[2] 崔一平[2] 袁春伟[3] 

机构地区：[1]东南大学化学化工系,江苏南京210096 [2]东南大学电子工程系,江苏南京210096 [3]东南大学生物分子电子学国家重点实验室,江苏南京210096

出　　处：《功能材料》2006年第8期1206-1209,共4页Journal of Functional Materials

摘　　要：设计并合成了5种综合性能较好的双羟乙氨基给体-硝基受体型偶氮化合物,它们分别具有DπA型和DπAπD型共轭结构。用Z-扫描方法研究它们的三阶非线性光学性质。实验结果表明双羟乙氨基给体和硝基受体组合与偶氮共轭链相连组成的分子具有较大的三阶非线性极化率。其中化合物5具有DπAπD型共轭结构,它包含两条从N,N-双羟乙氨基给体到硝基受体的共轭链,因此较大的分子内电荷转移使三阶极化率γ达到2.958×10-33esu,并且在化合物的共轭链中引入具有较低离域能的芳香杂环能增大三阶极化率。Nonlinear optical azo chromophores with dihydroxylethylamino donors and nitro acceptors were designed and synthesized. The measurements of third-order hyperpolarizabilities were performed using Z-scan technique with picsosecond laser pulses at 1064nm. Results indicate that larger third-order polarizabilities γ can be readily obtained in such chromophores because of increasing of strength of withdrawing group and conjugation length. Especially two-dimensionally chromophore 5 with two donor-acceptor conjugation path exhibits large third-order hyperpolarizability and excellent transparency. The incorporation of heteroaromatic rings can allow for enhancement of molecular hyperpolarizabilities.

关 键 词：Z-扫描 三阶光学非线性 偶氮分子 

分 类 号：TQ613[化学工程—精细化工]