Radiative transfer calculations in multilayer systems with smooth or rough interfaces

Authors: Jérôme Caron; Christine Andraud; Jacques Lafait

Source: Journal of Modern Optics, Volume 51, Number 4, 10 March 2004 , pp. 575-595(21)

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Abstract:

A very general discrete-ordinate method is presented for radiative transfer calculations in plane-parallel systems with partially reflecting interfaces. It is the natural extension of existing treatments for atmospheres (like DISORT) to account for changes of refractive index (Fresnel interfaces). The system under study is made of several dielectric layers, each layer containing spherical particles which produce anisotropic scattering (Mie scatterers). Incident light can be either collimated at normal or oblique incidence, or diffuse. A reflecting substrate can be added to the system. A procedure can be used to calculate the scattered fluxes at arbitrary angles, from the fluxes firstly obtained at a fixed set of polar angles. An efficient matrix formalism allows one to consider various boundary conditions: smooth or rough (scattering) interfaces. Surface scattering is introduced through a combination of Kirchhoff's expressions (for the specular reflection attenuation) and a geometrical optics model (for the scattering lobe). Comparisons with previous models and examples of simulations are presented. The main limitation of the method seems to be the approximate account for the polarization in this scalar treatment.

Document Type: Research article

DOI: http://dx.doi.org/10.1080/09500340310001626488

Affiliations: 1: Laboratoire d'Optique des Solides (Unité Mixte de Recherche no. 7601) Université Pierre et Marie Curie Case 80 4 place Jussieu 75252 Paris Cedex 05 France

Publication date: 2004-03-10

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