应用全息表征对光致聚合物机制的探究

发布时间：2018-05-06 23:07

本文选题：光致聚合物 + 全息性能　；参考：《南京理工大学》2017年硕士论文

【摘要】：随着信息技术以及多媒体技术的快速发展,需要存储、传递、处理和利用的信息量也在急剧增加,人们急需要一种高容量,高速度的存储技术。光全息存储技术因其具有存储密度高、存储容量大、数据传输速率高、数据搜索快等优点而成为其中一个热点。寻找合适的材料一直是光全息存储技术的重点,而光致聚合物材料由于具备感光灵敏度高、存储容量大、成本低廉、衍射效率高、制备简便、无毒环保等优点引起了广泛的关注和研究。其中聚乙烯醇/丙烯酰胺(PVA/AA)光致聚合物以其独特的优越性能被人们认为是最具有前景的光全息存储材料之一。本论文主要对这种光致聚合物材料的全息性能进行了深入的研究。本文对PVA/AA光致聚合物材料的基本理论进行深入的了解,包括其组成成分、全息记录过程中材料内部的光化学反应机制、曝光时材料内部的复合、漂白以及扩散机制,并在此基础上尝试运用数学方法构建内部反应模型并与宏观的光学参数联系起来。模型中包括了单体分子的扩散效应、非本地性效应以及一次谐波折射率调制效应等等。利用这个模型,本文首先将仿真结果与实验数据进行了拟合来确定模型的准确性。然后通过模型来研究曝光过程中材料内部各个组分的浓度分布变化情况。最后结合光致聚合物材料的光化学反应动力学过程,通过改变不同的参数条件,例如空间频率、扩散速率、曝光强度、聚合反应速率等因素,得到它们对光致聚合物材料的全息性能主要包括折射指数等的影响,进行理论的分析并得到一些结论。
[Abstract]:With the rapid development of information technology and multimedia technology, the amount of information that needs storage, transmission, processing and utilization is also increasing rapidly. People urgently need a high capacity, high speed storage technology. The optical holographic storage technology has the advantages of high storage density, large storage capacity, high data transmission rate and fast data search. One of the hot spots. Finding the appropriate materials has always been the focus of optical holographic storage technology, and photopolymer materials have attracted wide attention and research due to the advantages of high sensitivity, large storage capacity, low cost, high diffraction efficiency, simple preparation and non-toxic environmental protection. The photopolymerization of polyvinyl alcohol / acrylamide (PVA/AA) It is considered to be one of the most promising holographic holographic storage materials for its unique advantages. This paper mainly studies the holographic properties of this photopolymer material. This paper has a deep understanding of the basic theory of PVA/AA photopolymer materials, including its composition, material in the process of holographic recording. The mechanism of photochemical reaction inside the material, the internal compound, bleaching, and diffusion mechanism of the material at exposure, and on this basis, try to construct the internal reaction model with the mathematical method and connect with the macroscopic optical parameters. The model includes the diffusion effect of the monomer molecules, the non local effect and the first harmonic refractive index modulation effect. And so on. Using this model, this paper first fits the simulation results with the experimental data to determine the accuracy of the model. Then the model is used to study the change of the concentration distribution of each component in the material during the exposure process. Finally, the photochemical reaction kinetics process of the photopolymer material is combined to change the different parameters. Conditions, such as spatial frequency, diffusion rate, exposure intensity, polymerization rate and so on, have obtained their effects on the holographic properties of photopolymer materials, including refraction index and so on. The theoretical analysis and some conclusions have been made.

【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O482.3;O438.1

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