论文部分内容阅读
可用于集成化、微型化、高效率、高密度、高速度器件的薄膜材料研究，是属当今世界科学技术发展的趋势和热点。有机电光聚合物薄膜近年来取得了很大进展，在有线电视和光纤通讯网络系统中展现出十分广泛的应用领域和非常诱人的前景。目前已获得的聚合物材料电光系数有的达到２０～３０ｍｐ／Ｖ，达到或接近可用于电光波导器件制作的无机电光晶体ＬｉＮｂＯ３的水平（γ３３＝３０ｐｍ／Ｖ），而且介电常数仅为３～５，电光响应速度达到ｆｓ。表现出诱人的特性。薄膜材料的实用化同其它功能晶体一样，由其应用对象和本身综合性能所决定，现在的电光聚合物薄膜尚存在：（１）易于发生退极化现象，分子取向的时间稳定性较差；（２）器件加工制作需要较高的操作温度，基质材料的玻璃化温度有的还较低；（３）光吸收损耗和热致折射率稳定性等问题。本文基于优化性能的材料工程考虑，研究材料性能产生机制，进而进行材料设计和基元的选择与组装，获得了较好的结果。目前已获得的纳米微晶聚合物薄膜，基质玻璃化温度已超过２００℃以上，可见光波段透光性好，电光系数高达８２．６ｐｍ／Ｖ，介电常数为３～６，且具有较好的时间与温度稳定性。电光与光折变效应分别取决于分子基之内电荷极化，分子、基元间的电?
It can be used to study the thin film materials of integrated, miniaturized, high efficiency, high density and high speed devices. It is a trend and hot point in the development of science and technology in the world today. Organic electro-optic polymer films have made great strides in recent years and have shown a very wide range of applications and very attractive prospects in cable television and optical fiber communication network systems. At present, the electro-optic coefficients of the obtained polymer materials reach to 20-30mp / V, reach or approach the level of the LiNbO3 (γ33 = 30pm / V) inorganic electro-optic crystal which can be used for the fabrication of the electro-optic waveguide device, and the dielectric constant is only 3 ~ 5, electro-optic response speed to fs. Show attractive features. The practical application of the thin film material is the same as that of other functional crystals, which is determined by its application object and its own comprehensive performance. Currently, the electro-optical polymer thin films still exist: (1) depolarization occurs easily, and the time stability of the molecular orientation is poor; (2) The device fabrication requires a higher operating temperature and the glass transition temperature of the matrix material is somewhat lower; and (3) the problems of light absorption loss and thermal induced refractive index stability. Based on the consideration of material engineering with optimized performance, this paper studies the mechanism of material properties, and then designs material and selects and assembles elements, obtaining good results. At present, the nanocrystalline polymer film has a glass transition temperature of more than 200 DEG C, good visible light transmission, good electro-optical coefficient of 82.6pm / V and dielectric constant of 3 to 6, and has good Time and temperature stability. Electro-optic and photorefractive effects depend on the charge polarization inside the molecule, the molecules, and the electric charges between the elements.