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在聚甲基丙烯酸甲酯 (PMMA)中掺入不同的偶氮染料并制成薄膜样品 ,以调制的线偏振Ar+ 激光(5 14nm ,CW)作为控制光 ,He Ne激光 (6 32 .8nm ,CW)为信号光 ,研究了样品的光致双折射效应及全光开关效应。通过对样品的响应特性和全光开关效应进行比较 ,发现电子推拉势较强的生色团分子在控制光作用下 ,可以产生较大的光致双折射效应 ,但光响应速度较慢 ,其光致双折射效应以光致异构取向为主要机制 ;而对于具有较弱电子推拉势的生色团分子 ,其光致双折射效应则主要来自光致异构烧孔机制 ,虽然其光致双折射效应小 ,但光响应速度快。
Different polymethylmethacrylates (PMMA) were doped with different azo dyes and made into thin film samples. The prepared linearly polarized Ar + laser (5 14 nm, CW) was used as the control light and the He Ne laser (6 32 .8 nm, CW) is the signal light, the photorefractive birefringence effect and the all-optical switching effect of the sample are studied. By comparing the response characteristics of the samples and the all-optical switch effect, it is found that the chromophore molecules with strong electron push-pull can produce larger photodiffraction birefringence effect under the control of light, but the light response speed is slower The photoinduced birefringence effect takes photoisomerization orientation as the main mechanism, while for the chromophore molecules with weaker electron push-pull potential, the photo-induced birefringence effect mainly comes from photoisomerization hole burning mechanism, Birefringence effect is small, but the light response speed.