高聚物—富勒烯体系薄膜微微秒三倍频效应研究

采用５０ｐｓ的１．０６ｕｍ的基频光，对用物理喷束沉积方法制备的聚乙烯咔唑Ｐｏｌｙ－富勒烯组合薄膜进行三倍频信号测量。在ＰＶＫ／Ｃ６０分层膜与混合膜中观测到三倍频信号增强，考虑到两者之间的电荷转移效应，在分层膜中，把该三阶非线性增强归因于ＰＶＫ与富勒烯Ｃ６０之间的电荷转移所生成的载流子引起的电偶极矩和极化强度增强，在混合膜中，则是电荷转移所生成的络合物起主要作用。

Study of Third Harmonic Generation in Polymer Fullerene Films

Optical third-harmonie generation (THG) in the poly (N-vinylearbazole) (abbreviated as PVI)-fullerene combination films has been studied by using a 50 pieoseeond Nd:YAG laser as the fundamental light source at 1.06 μm. THG enhancement is observed in the PVK/C60 multilayer and mixed films compared with pure PVK and C60 films. Considering the charge-transfer (CT) process between these two materials, we attribute this third-order nonlinearity enhancement to the change of dipole moment and susceptibility caused by the carriers generated by the CT process in multilayer film. But in mixed film, the CT complex plays an important role.