Li Pengcheng, Lv Donghong, He Honghui, Ma Hui
Opt Express. 2018 Feb 19;26(4):3791-3800. doi: 10.1364/OE.26.003791.
Polarization imaging and Mueller polarimetry provide powerful tools for probing the microstructure of complex anisotropic media, which is a core task in material science, biomedical diagnosis and many research fields. However, Mueller matrix elements and many polarization parameters are sensitive to the spatial orientation of the sample and experimental configurations, hindering the effectiveness for distinguishing different sources of anisotropies. In this paper, we propose a set of rotation invariant parameters and corresponding orientation parameters, which are explicit functions of the Mueller matrix elements. They are valid under the condition that the illumination and detection directions are collinear with the rotation axis of the sample. More detailed examinations show that these parameters have potential applications for fast analyzing different anisotropy contributions in the media, such as birefringence, dichroism, and their coexistence. The conclusions are validated with Monte Carlo simulations and the experimental results of transparent tape samples.
偏振成像和穆勒偏振测量法为探测复杂各向异性介质的微观结构提供了强大工具，这是材料科学、生物医学诊断及许多研究领域的核心任务。然而，穆勒矩阵元素和许多偏振参数对样品的空间取向和实验配置敏感，这阻碍了区分不同各向异性来源的有效性。在本文中，我们提出了一组旋转不变参数和相应的取向参数，它们是穆勒矩阵元素的显式函数。在照明和检测方向与样品的旋转轴共线的条件下，它们是有效的。更详细的研究表明，这些参数在快速分析介质中不同的各向异性贡献方面具有潜在应用，例如双折射、二向色性及其共存情况。通过蒙特卡罗模拟和透明胶带样品的实验结果验证了这些结论。
