基于瞬时Stokes矢量和Mueller演算的非线性突变传感模型
Orthogonality breaking sensing model based on the instantaneous Stokes vector and the Mueller calculus
摘要：
通过正交性破坏的极化感测最近已被提出作为用于使用特定双频双极化（DFDP）源执行直接和快速极化测量的替代技术。基于瞬态Stokes-Mueller理论描述了DFDP光束强度的高频演化，详细分析了DFDP光束与双折射、二向色和去偏振样品的相互作用。这使我们能够确认，正交性破坏产生的样品双衰减，而这种技术是免疫双折射和对角去偏振。我们进一步分析了这种技术的鲁棒性时，通过双折射波导进行偏振传感，并随后确定基于光纤的内窥镜测量的最佳DFDP源配置。最后，我们考虑一个随机去极化模型的基础上合奏的随机线性diattenuators，这使得它可以理解的渐进消失的检测到的正交性破坏信号的样本的空间异质性的增加，从而确认这种方法的不敏感性对角去极化。正交性破坏信号完全是由于样品二向色性的事实对于在示出几个同时效应的样品中的这种各向异性参数的精确解耦表征是有利的特征。
英文摘要：
Polarimetric sensing by orthogonality breaking has been recently proposed as an alternative technique for performing direct and fast polarimetric measurements using a specific dual-frequency dual-polarization (DFDP) source. Based on the instantaneous Stokes-Mueller formalism to describe the high-frequency evolution of the DFDP beam intensity, we thoroughly analyze the interaction of such a beam with birefringent, dichroic and depolarizing samples. This allows us to confirm that orthogonality breaking is produced by the sample diattenuation, whereas this technique is immune to both birefringence and diagonal depolarization. We further analyze the robustness of this technique when polarimetric sensing is performed through a birefringent waveguide, and the optimal DFDP source configuration for fiber-based endoscopic measurements is subsequently identified. Finally, we consider a stochastic depolarization model based on an ensemble of random linear diattenuators, which makes it possible to understand the progressive vanishing of the detected orthogonality breaking signal as the spatial heterogeneity of the sample increases, thus confirming the insensitivity of this method to diagonal depolarization. The fact that the orthogonality breaking signal is exclusively due to the sample dichroism is an advantageous feature for the precise decoupled characterization of such an anisotropic parameter in samples showing several simultaneous effects.
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