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设计并合成了3种具有较高双光子吸收截面的新型二苯乙烯衍生物双光子生色团,利用在飞秒激光下的双光子漂白现象,在掺杂有3种二苯乙烯衍生物的聚甲基丙烯酸甲酯薄膜内进行了三维数据光存储实验,研究了三者的双光子漂白能力并分析了激发功率对双光子荧光行为的影响。双光子漂白光存储的特性表明:曝光时间一定时,降低激发功率可以提高分辨率;激发功率不变,降低曝光时间也可以提高分辨率;但要提高存储速度,需用较大的激发功率。采用较大的激发功率(13.4mW)和较短的曝光时间(20ms),利用双光子写入和读出方法在掺杂薄膜内部实现了三维超高密度光存储,理论存储密度可达14Gbit/cm3。双光子漂白速率对激发功率的依赖关系的研究表明,双光子漂白的机理涉及到三个光子的协同作用。
Three novel two-photon chromophores of stilbene derivatives with high two-photon absorption cross-sections were designed and synthesized. By using the two-photon bleaching phenomenon in femtosecond laser, Three-dimensional data light storage experiments were carried out in the polymethylmethacrylate film. The two-photon bleaching ability of the three was studied and the effect of excitation power on the two-photon fluorescence was analyzed. The characteristic of two-photon bleaching optical storage shows that when the exposure time is constant, reducing the excitation power can improve the resolution; the excitation power remains unchanged and the exposure time can be reduced to improve the resolution; but to increase the storage speed, larger excitation power is required. Three-dimensional ultra-high density optical memory is realized in the doping film by using two-photon writing and readout method with larger excitation power (13.4mW) and shorter exposure time (20ms). The theoretical storage density can reach 14Gbit / cm3. Studies on the dependence of the two-photon bleaching rate on the excitation power show that the mechanism of two-photon bleaching involves the synergy of three photons.