Effect of Dependent Scattering on Light Absorption in Highly Scattering Random Media

Abstract

The approximate nature of radiative transfer equation (RTE) leads to a bunch of considerations on the effect of "dependent scattering" in random media, especially particulate media composed of discrete scatterers, in the last a few decades, which usually indicates those deviations RTE (combined with ISA) lead to from experimental and exact numerical results due to electromagnetic wave interference. Here we theoretically and numerically demonstrate the effect of dependent scattering on absorption in disordered media consisting of highly scattering scatterers. By making comparison between the independent scattering approximation-radiative transfer equation (ISA-RTE) and the full-wave coupled dipole method (CDM), we find that deviations between the two methods increase as scatterer density in the media increases. The discrepancy also grows with optical thickness. To quantitatively take dependent scattering effect into account, we develop a theoretical model using quasi-crystalline approximation (QCA) to derive dependent-scattering corrected radiative properties, based on the path-integral diagrammatic technique in multiple scattering theory. The model results in a more reasonable agreement with numerical simulations. The present work has profound implications for the coherent scattering physics in random media with absorption, correctly modeling light absorptance in random media and interpreting the experimental observations in various applications for random media such as solar energy concentration, micro/nanofluids, structural color generation, etc.

arXiv comment30 pages, 8 figures, submitted

References in corpus (5)

• Multiple scattering of classical waves: from microscopy to mesoscopy and diffusion
• Light fields in complex media: mesoscopic scattering meets wave control
• Position-dependent diffusion of light in disordered waveguides
• Induced dipole-dipole interactions in light diffusion from point dipoles
• Achieving strongly negative scattering asymmetry factor in random media composed of dual-dipolar particles

Cited by in corpus (7)

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• The dependent scattering effect on radiative properties of micro/nanoscale discrete disordered media
• Semi-analytical technique for the design of disordered coatings with tailored optical properties
• Analysis of dependent scattering mechanism in hard-sphere Yukawa random media
• Structural correlations and dependent scattering mechanism on the radiative properties of random media