Chan Wing S, Talghader Joseph
Department of Electrical and Computer Engineering, University of Minnesota, Twin Cities, 200 Union St. SE, Minneapolis, MN 55455, USA.
Opt Express. 2010 Feb 1;18(3):3109-15. doi: 10.1364/OE.18.003109.
Strong correlations have been found in the polarization of light transmitted through a polycrystalline material and the grain sizes and orientations of that material. Experiments and supporting simulations with irregularly shaped single quartz crystals show that linear polarization is lost more rapidly as grain sizes decrease and the angular spread of the crystal orientations increase. A quantitative method using Stokes matrices to predict such changes is described and experimentally verified using an apparatus to vary the orientation of irregular quartz crystals. Grain sizes are varied between 1mm and 4mm, and the angular spreads in the crystal orientation are varied between 9 degrees and 27 degrees . This technique has applications to identify changes in crystal structure of transparent uniaxial polycrystalline materials, especially in the nondestructive characterization of glacial ice.
在透过多晶材料传输的光的偏振与该材料的晶粒尺寸和取向之间发现了强相关性。对不规则形状的单个石英晶体进行的实验及辅助模拟表明，随着晶粒尺寸减小以及晶体取向的角度分布增加，线偏振的损失更快。描述了一种使用斯托克斯矩阵来预测此类变化的定量方法，并通过改变不规则石英晶体取向的装置进行了实验验证。晶粒尺寸在1毫米至4毫米之间变化，晶体取向的角度分布在9度至27度之间变化。该技术可用于识别透明单轴多晶材料的晶体结构变化，特别是在冰川冰的无损表征方面。
