掺杂及表面等离激元对液晶光折变影响的研究

发布时间：2018-05-04 06:26

  本文选题：实时全息记录 + 液晶　； 参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：近年来,虚拟现实技术快速发展,以实时全息记录和显示为应用背景的液晶光折变效应再次得到人们的关注。与此同时,近十多年,基于表面等离激元的应用研究取得了重大进展,表面等离激元在微纳光学器件中起到的至关重要的作用引来了众多科研工作者的目光。本课题将总结并介绍目前液晶光折变和表面等离激元的研究和应用概况。在充分了解前人的工作基础上,本课题以光导Zn Se作取向层的具有较大的温度适用范围的ZLI-5200-100型Super-twisted向列液晶系统为研究对象,对纯液晶系统、C60-doped系统以及三种浓度(0.01 wt.%,0.1 wt.%和0.5 wt.%)下的dye-doped系统的光折变性能进行了横向对比,并在C60-doped系统中得到了响应时间小于10 ms的同时,衍射效率达到20.7%的优良光折变性能的实验结果。此外,在研究C60-doped液晶系统时,我们发现了明显的表面等离激元的作用现象——单束写入光对探测光的衍射效率的增强效应,此效应成为系统中LC/Zn Se界面处表面等离激元被激发的有力佐证。通过计算LC/ZnSe交界面处改性层的电荷积累情况,我们说明了系统满足用561 nm波长的激光激发表面等离激元的条件。以表面等离激元模型为基础,我们对各个掺杂系统的衍射效率随外加电场的变化曲线以及各系统之间的差异有了更好的解释。在课题的最后,我们还针对液晶系统与金属/介质界面的不同点,对LC/Zn Se界面处表面等离激元波方程进行了理论推导,并对方程进行了求解。本课题的研究成果将为利用不同材料和浓度的掺杂来改善液晶系统的光折变性能提供思路,并为低耗能的表面等离激元的激发和应用提供一种利用向列液晶实现的新型结构。
[Abstract]:In recent years, the rapid development of virtual reality technology has attracted the attention of the liquid crystal photorefractive effect with real time holographic recording and display as the application background. At the same time, the application of surface plasmon based on the surface plasmons has made great progress in the last more than 10 years, and the surface plasmon polaritons play an important role in the micro optical devices. This subject will summarize and introduce the current research and application of liquid crystal photorefractive and surface plasmons. On the basis of understanding the previous work, the ZLI-5200-100 type Super-twisted nematic liquid crystal system with a larger temperature range of Zn Se as the orientation layer In the study, the transverse comparison of the photorefractive properties of the pure liquid crystal system, C60-doped system and three concentrations (0.01 wt.%, 0.1 wt.% and 0.5 wt.%) was carried out, and the experimental results of the excellent photorefractive performance of the diffraction efficiency of 20.7% were obtained in the C60-doped system, while the response time was less than 10 ms. When we investigate the C60-doped liquid crystal system, we find the obvious effect of the surface plasmon - the enhancement effect of the single beam to the diffraction efficiency of the probe light. This effect becomes a powerful proof of the excitation of the excitations at the surface of the LC/Zn Se interface in the system. By calculating the charge accumulation of the modified layer at the LC/ ZnSe interface, I We show that the system satisfies the conditions for the excitation of the surface plasmon with a laser with 561 nm wavelengths. Based on the surface plasmon model, we have a better explanation of the diffraction efficiency of the various doping systems with the change curve of the applied electric field and the difference between the systems. At the end of the subject, we also aim at the liquid crystal system and the metal / metal. A theoretical deduction is made on the surface plasmon wave equation at the surface of LC/Zn Se interface, and the equations are solved. The research results of this topic will provide ideas for the improvement of the optical folding of the liquid crystal system by using different materials and concentrations of doping to improve the excitation and application of the low energy dissipation surface plasmon. A new structure for the use of nematic liquid crystals.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O753.2
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本文编号：1841954