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Mueller matrix measurements on absorbing turbid medium

机译：吸收混浊介质的穆勒矩阵测量

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Polarization parameters of diffuse backscattered light from a turbid sample are sensitive to its structural properties and can, therefore, be used to probe morphological features of tissue and, thus, monitor changes that arise due to a disease. Extraction of morphological information from measured polarization parameters, however, requires a careful understanding of the dependence of these on factors such as size, size distribution, shape, and dielectric constant of the scatterers, which are often quite involved. In particular, the presence of absorption complicates the dependence of polarization parameters on tissue morphological features. We have found that, while for medium comprising small size scatterers (Rayleigh scatterers), the depolarization shows the expected decrease with an increase in the absorption of the scattering medium, a counterintuitive behavior was observed for larger size (>lambda) scatterers. Further analysis of the results suggests that the observed behavior might arise due to the relative contribution of two depolarizing processes, one resulting from a series of out-of-plane scattering and the other due to the angular variation of the state of polarization in a single scattering event.
机译：来自浑浊样品的漫射反向散射光的偏振参数对其结构特性敏感，因此可以用于探测组织的形态特征，从而监视由于疾病引起的变化。然而，从测得的极化参数中提取形态信息需要仔细了解这些参数对诸如散射体的尺寸，尺寸分布，形状和介电常数等因素的依赖性，而这些因素通常是非常复杂的。特别地，吸收的存在使极化参数对组织形态特征的依赖性复杂化。我们发现，虽然对于包含小尺寸散射体（瑞利散射体）的介质，去极化显示了随着散射介质吸收率的增加而预期的降低，但对于较大尺寸（>λ）散射体，却观察到了违反直觉的行为。对结果的进一步分析表明，观察到的行为可能是由于两种去极化过程的相对作用而引起的，一种是由一系列平面外散射引起的，另一种是由于单个偏振态的角度变化引起的。散射事件。

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