Prof. Mercè Durfort Profile

Prof. Mercè Durfort

at Univ de Barcelona

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Proceedings Article | 5 March 2021 Presentation + Paper

Retrieving physical information of depolarizing systems

Albert Van Eeckhout, Enric Garcia-Caurel, Teresa Garnatje, Juan Carlos Escalera, Mercè Durfort, Josep Vidal, José Gil, Javier García-Romero, Razvigor Ossikovski, Ignacio Moreno, Juan Campos, Angel Lizana

Proceedings Volume 11646, 116460K (2021) https://doi.org/10.1117/12.2578161

KEYWORDS: Statistical analysis, Scattering, Tissues, Scattering media, Polarimetry, Physics, Particles, Multiple scattering, Light scattering, Inspection

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Light interaction with material systems may introduce depolarization to the incident light. This phenomenon comes from multiple scattering processes that take place inside the media and strongly depends on the particle characteristics. In the case of botany, plant leaves can be understood as depolarizing systems. A non-contact method to analyze these samples consist of illuminating them with well-known polarized light and study the scattered light to retrieve the physical characteristics of the sample. This physical study can be done by measuring the Mueller matrix of samples, in which the physical information of samples is encoded in their 16 elements and further mathematical treatment is required to extract the information. In the case of scattering systems, the depolarization content carries very valuable information but it is usually not inspected in the botanic field. A way to study depolarized content is by determining the so-called depolarization index PΔ, which gives an overall measure of the degree of depolarization of a system but it does not measure possible anisotropic dependence of the depolarization. For instance, a depolarizer equally depolarizing any fully polarized input polarization or a depolarizer that depolarizes them in a strongly heterogenous way, may lead to the same PΔ value. In contrast, the Indices of Polarimetric Purity (IPP) are a group of metrics that further synthesize the depolarizing content, taking into account the anisotropic depolarization. In this work, we describe the main physical characteristics of samples achieved by using these IPP through plant samples. Moreover, we show how IPP highlights some structures hidden in regular intensity measurements, highlighting the potential of these metrics for botanical applications.

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