通过对新型的染料LB膜(花氰-花生酸复合LB膜)的吸收光谱的测试,说明了LB膜中染料分子H-聚体结构的存在,而在立体简并四波混频实验中观察到这种LB膜具有可逆的光学记录与擦除效应,实验表明,在其中建立一个稳定的光栅,所用的记录光脉冲强度为30 MW/cm2,需要的累积记录时间为80 ns(10个脉冲).最后在简化的三能级系统中,以分子处于各态的布居光栅模型说明了光致H-聚体,单体之间的转化是这种光学记录效应的主要原因.

A new kind of dye LB films, in which dye molecules formed H-aggregates units with a shift of absorption band in voilet direction, is reported. Invertable optical recording effect has been observed in the LB films in the three-dimentional degenerate four-wave mixing experiment. The accumulating recording time needed to build up a stable grating in the film is about 80 ns(coresponding with 10 pulses) with the recording intensity of pulse beams of 30 MW/cm2. The main mechanism of the optical recording effect in the film is the light-induced transformation between H-aggregate and monomer structures of dye molecules, based on the po;ulation grating model in simplified three-state system.