Preparation, optical and optical storage properties of anthracene derivatives two-photon absorption materials

本文制备了13种未见报道的蒽类新衍生物，研究了新化合物在N，N-二甲基甲酰胺(DMF)中的单光子光学性质，包括线性吸收光谱、荧光光谱和荧光量子产率；利用高斯03软件包中的密度泛函理论(DFT)模拟和计算了化合物分子基态几何结构、分子的前线轨道分布和能级，分析了电子跃迁特征；采用脉宽为120 fs、波长为800nm和重复频率为1 kHz（钛蓝宝石激光器）的脉冲激光研究了新化合物的双光子激发荧光，采用参比法测定了新化合物的DMF溶液的双光子吸收截面；采用Z-扫描法测定了新化合物PMMA薄膜的非线性双光子吸收系数和双光子吸收截面；讨论了化学结构对材料上述性质的影响及其规律。在激光工作波长为800nm、脉宽为80fs、写入功率为30mW、读出功率为4.3mW、物镜数值孔径为0.65的条件下，采用本文合成的新材料作为记录介质利用双光子荧光漂白机理成功实现30层三维信息存储（点间距为4μm，层间距为10μm，记录点的尺寸约为1.5μm）每一层记录点清晰可辨；薄膜质量对三维存储性能有明显的影响，随着记录深度的增加，荧光信号的对比度没有明显改变，读出信号依然清晰，未发生点与点之间的串扰现象，表明本文合成的新材料具有良好的双光子吸收三维信息存储性能，展示了该类新材料在三维超高密度信息存储领域的重要应用前景。In this paper, 13 kinds of novel anthracene derivatives were synthesized and prepared. Linear absorption, fluorescence emission spectra and fluorescence quantum yields were measured in DMF. Density functional theory (DFT) was carried out for these 13 molecules by GAUSSIAN 03 program package. Molecular ground state geometry structure, the distribution of frontier orbitals and energy levels of the molecular analysis of the characteristics of the electronic transition were obtained and analyzed for the one-photon absorption properties. Then, the two-photon excited fluorescence was surveyed by a 120-fs 800-nm pulse Ti: sapphire femto-second laser operating at 1 kHz repetition rate in the DMF and two-photon absorption cross-sections were calculated by reference method in DMF solution. Moreover, the thin film of target compound was prepared by mixed in PMMA, and the two-photon absorption coefficient of molecular films was obtained in order to calculate two-photon absorption cross-sections of film by the Z-scan technology. Effects of chemical structure on the properties of materials were discussed on the above properties of materials. The 30-layer three-dimensional information storage were successfully realized by the synthesis of new materials as the recording medium using two-photon fluorescence bleaching mechanism. For data writing and reading, the optical storage system’s laser is an 800-nm, 80-fs pulses at a repetition rate of 80 MHz. The recording power was 30 mW and reading power was 4.3 mW, numerical aperture NA= 0.65. The separation between two adjacent layers is about 10 μm, and the distance between adjacent dots in each layer is about 4 μm with crosstalk- free. Film quality have a significant impact on the three-dimensional storage performance, as recording depth increases, the contrast of the fluorescence signal did not change significantly, the readout signal was still clear, and it had not occur between points of crosstalk phenomenon. These results indicated that the synthesized materials are well suited for two-photon absorption three-dimensional information storage performance and this kind of new material in the three-dimensional ultra-high density information storage would be promising application prospect