Enpolarization of light by scattering media

Sorrentini, Jacques; Zerrad, Myriam; Soriano, Gabriel; Amra, Claude

doi:10.1364/oe.19.021313

Cited by 36 publications

(42 citation statements)

References 26 publications

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“…Leekley et al [16] proposed in 1970 a method utilizing linearly polarized light, relying on the assumption that the surface reflectance retains its polarization state, whereas the bulk reflectance becomes completely depolarized. The validity of these assumptions is, however, highly dependent on the surface and bulk properties of the material, which was later reported in several studies [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Separation of surface and bulk reflectance by absorption of bulk scattered light

et al. 2013

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A method is proposed for separating light reflected from turbid media with a rough surface into a bulk and a surface component. Dye is added to the sample, thereby increasing absorption and canceling bulk scattering. The remaining reflected light is surface reflectance, which can be subtracted from the total reflectance of an undyed sample to obtain the bulk component. The method is applied to paper where the addition of dye is accomplished by inkjet printing. The results show that the bulk scattered light is efficiently canceled, and that both the spectrally neutral surface reflectance and the surface topography of the undyed paper is maintained. The proposed method is particularly suitable for characterization of dielectric, highly randomized materials with significant bulk reflectance and rough surfaces, which are difficult to analyze with existing methods. A reliable separation method opens up for new ways of analyzing, e.g., biological tissues and optical coatings, and is also a valuable tool in the development of more comprehensive reflectance models.

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Section: Introductionmentioning

confidence: 99%

Separation of surface and bulk reflectance by absorption of bulk scattered light

et al. 2013

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“…It has been shown both numerically and experimentally that the average degree of polarization can increase from 0 to 0.75 when the light source is highly coherent, and the medium has little absorption compared to scattering. [35][36][37][38] It is possible that enpolarization effects could influence the comparison of reflectance and transmission, especially when the two modes have very different pathlength distributions, and this potential should be investigated in future experimental work.…”

Section: Discussionmentioning

confidence: 99%

Transmission versus reflectance spectroscopy for quantitation

2018

J. Biomed. Opt.

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Abstract. The objective of this work was to compare the accuracy of analyte concentration estimation when using transmission versus diffuse reflectance spectroscopy of a scattering medium. Monte Carlo ray tracing of light through the medium was used in conjunction with pure component absorption spectra and Beer-Lambert absorption along each ray's pathlength to generate matched sets of pseudoabsorbance spectra, containing water and six analytes present in skin. PLS regression models revealed an improvement in accuracy when using transmission compared to reflectance for a range of medium thicknesses and instrument noise levels. An analytical expression revealed the source of the accuracy degradation with reflectance was due both to the reduced collection efficiency for a fixed instrument etendue and to the broad pathlength distribution that detected light travels in the medium before exiting from the incident side. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…Additional complexity was brought by the introduction of random media, hence mixing spatial and temporal disorders [10][11][12]. Specific effects were recently emphasized at the speckle size, like the local (temporal) enpolarization of light [13][14][15], and the multi-scale (spatial) depolarization [11,12,16]. Most effects were confirmed by experiment [16][17][18][19], which justifies a motivation to go further in these fields.…”

Section: Introductionmentioning

confidence: 95%

“…In all situations the behavior of the far field pattern is intimately connected with the sample microstructure, which drives the angular, spectral and polarization properties. Recent examples give a detailed analysis of the polarization degree at the speckle size in the far field [11,12,16,25], and emphasize spatial depolarization [11,16,26] and temporal repolarization [14,15] of light, all phenomena which strongly depend on the samples microstructure (roughness, inhomogeneity). Applications were also found for biological tissues and others.…”

Section: Introductionmentioning

confidence: 99%

“…Such description of the scattering process is very practical and allowed to reveal unexpected phenomena such as the en-polarization process [14,15]; also, it allowed to predict a spectral depolarization [3,28] responsible for strong modification of the polarization degree (dop) histograms [13], as well as the modification of time coherence [29] in disordered media. However this phenomenological model is valid for highly heterogeneous samples and fails at intermediate electromagnetic regimes, whereas these regimes occur in numerous situations.…”

Section: Introductionmentioning

confidence: 99%

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