Importance of shadowing and multiple reflections in emission polarization

Chang, Peter; Flitton, Jonathan C.; Hopcraft, K. I.; Jakeman, E.; Jordan, David; Walker, John

doi:10.1088/0959-7174/12/1/301

Cited by 16 publications

(6 citation statements)

References 12 publications

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“…Also, since the solution contains the polarization-state of the wave the approach can be used to investigate, for example, the emission polarization effects of infra-red radiation, e.g. [19], from left-handed media. Other applications include further polarization effects, such as the Brewster angle, and to analyse how superlensing properties are sensitive to the polarization state and by roughness of the lens surfaces, and these will be treated elsewhere.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Between right- and left-handed media

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Hopcraft

Jakeman

et al. 2009

Optics Communications

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We report analytical calculations for the propagation of electromagnetic radiation through an inhomogeneous layer whose refractive index varies in one dimension situated between bulk right-and left-handed media. Significant field localization is generated in the layer that is caused by the coherent superposition of evanescent waves. The strength of the field localization and the transmission properties of the layer are investigated as a function of the layer width, losses and defects in the refractive index; the former two being modelled by continuous changes, and the latter by discontinuous changes, in the index profile.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Between right- and left-handed media

Ingrey

Hopcraft

Jakeman

et al. 2009

Optics Communications

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“…For example, from Fresnel reflectance theory, DoLP is known to increase as observation angle relative to normal increases. 37 Concerning the mBRDF angle dependence, perfectly diffused Lambertian surfaces have uniform f r for all angles; however, realistic surfaces typically have specular components with higher values within the normal incidence specular lobe. 30 We assume the observation angle can be determined by estimating surface orientation relative to normal using lidar 3-D point-cloud imagery.…”

Section: Data Representationmentioning

confidence: 98%

Hybrid passive polarimetric imager and lidar combination for material classification

et al. 2020

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We investigate the augmentation of active imaging with passive polarimetric imaging for material classification. Experiments are conducted to obtain a multimodal dataset of lidar reflectivity and polarimetric thermal self-emission measurements against a diverse set of material types. Using the assumption that active lidar imaging can provide high-resolution threedimensional spatial information, a known surface orientation is utilized to enable higher fidelity classification. Machine learning is applied to the dataset of monostatic lidar unidirectional reflectivity and passive longwave infrared degree of linear polarization features for material classification. The hybrid sensor technique can classify materials with 91.1% accuracy even with measurement noise resulting in a signal-to-noise ratio of only 6 dB. The application of the proposed technique is applicable for the classification of hidden objects or could assist existing spatial-based object classification. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 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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“…Taking the magnitude squared of r and t, respectively, we obtain the intensity reflectivity and transmittance as [18][19][20][21] (a) (b)…”

Section: Polarization and The Complex Fresnel Equationsmentioning

confidence: 99%

“…Jordan et al provide an approach for doing this by modeling the orientation angle of the interface as comprising a probability distribution over angles. 18,56,57 In general, we can expect that, as the surface roughness becomes large, multiple reflections among surface facets increase, causing a reduction in reflectivity and a consequent increase in the emissivity. 14 The effect on emission polarization is more complex.…”

Section: Rough Surfaces and Scattering Mediamentioning

confidence: 99%

Review of thermal infrared polarimetry, I: theory

Hagen

2022

Opt. Eng.

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We review the physics underlying thermal infrared emission, focusing on the processes that generate polarization. We also discuss a number of features of the theory that are not widely discussed in the literature, including the Straubel theorem for absorbing media, the mixed Poynting vector, and the emission of nonisothermal media. Using a model for emission from nonisothermal media, we present a quantitative discussion of the conditions under which Kirchhoff's law is valid. Using this model, we show how it is possible for many blackbody simulators and infrared camera shutters to produce emission very close to true blackbodies.

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Importance of shadowing and multiple reflections in emission polarization

Cited by 16 publications

References 12 publications

Between right- and left-handed media

Between right- and left-handed media

Hybrid passive polarimetric imager and lidar combination for material classification

Review of thermal infrared polarimetry, I: theory

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