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arXiv 2012.11210cond-mat.dis-nnphysics.optics
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光的扩散和局域化中的纵模

Longitudinal modes in diffusion and localization of light

B. A. van Tiggelen, S. E. Skipetrov

摘要:

在这项工作中,我们包括纵向电磁波的弹性散射的传输理论使用的介质充满了点状,电偶极子。纵波和横波之间的干涉产生了两个新的通道,其中一个通道允许能量传输。这幅图是通过将辐射转移的独立散射框架扩展到包括二元偶极-偶极相互作用而得出的。我们计算了光在新的输运通道中的扩散常数,并通过考虑态密度、均分和洛仑兹局域场,研究了纵波在光扩散的其他方面的作用。在强散射状态下,不同的传输机制耦合并施加最小的电磁波传导率,从而防止介质中光的安德森局域化。我们扩展了自洽理论的本地化和比较广泛的数值模拟的预测。

英文摘要:

In this work we include the elastic scattering of longitudinal electromagnetic waves in transport theory using a medium filled with point-like, electric dipoles. The interference between longitudinal and transverse waves creates two new channels among which one allows energy transport. This picture is worked out by extending the independent scattering framework of radiative transfer to include binary dipole-dipole interactions. We calculate the diffusion constant of light in the new transport channel and investigate the role of longitudinal waves in other aspects of light diffusion by considering the density of states, equipartition, and Lorentz local field. In the strongly scattering regime, the different transport mechanisms couple and impose a minimum conductivity of electromagnetic waves, thereby preventing Anderson localization of light in the medium. We extend the self-consistent theory of localization and compare the predictions to extensive numerical simulations.

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