Diffusive transport of light in three-dimensional disordered Voronoi structures

被引:7
|
作者
Sadjadi, Zeinab [1 ]
Miri, MirFaez [1 ]
Stark, Holger [2 ]
机构
[1] IASBS, Zanjan 45195, Iran
[2] Tech Univ Berlin, Inst Theoret Phys, D-10623 Berlin, Germany
来源
PHYSICAL REVIEW E | 2008年 / 77卷 / 05期
关键词
D O I
10.1103/PhysRevE.77.051109
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The origin of diffusive transport of light in dry foams is still under debate. In this paper, we consider the random walks of photons as they are reflected or transmitted by liquid films according to the rules of ray optics. The foams are approximately modeled by three-dimensional Voronoi tessellations with varying degree of disorder. We study two cases: A constant intensity reflectance and the reflectance of thin films. Especially in the second case, we find that in the experimentally important regime for the film thicknesses, the transport-meanfree path l* does not significantly depend on the topological and geometrical disorder of the Voronoi foams including the periodic Kelvin foam. This may indicate that the detailed structure of foams is not crucial for understanding the diffusive transport of light. Furthermore, our theoretical values for l* fall in the same range as the experimental values observed in dry foams. One can therefore argue that liquid films contribute substantially to the diffusive transport of light in dry foams.
引用
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页数:8
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