Guo Wei, Prasad Sudhakar
Department of Physics and Astronomy, The University of New Mexico, Albuquerque, NM 87131, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2003 May;67(5 Pt 2):056615. doi: 10.1103/PhysRevE.67.056615. Epub 2003 May 19.
In this paper, we study the problem of multiple scattering of light from a randomly occupied optical lattice, thereby extending the first-order Born analysis of the previous paper. A full multiple-scattering analysis is essential to a complete understanding of the nature of light propagation inside a medium. Our calculations show that the incident wave, when resonant with the atomic medium, is rapidly extinguished due to multiple scattering. The decay constant depends critically on the incident wavelength, the lattice constant, the average number density of atoms, and their polarizability. Both the Bragg scattering amplitudes and directions are modified as a result of multiple scattering. Because of the random site occupation of an otherwise regular lattice structure, a coherent enhancement of the scattering cross section is also predicted to occur along a discrete set of directions that are related to the strictly backward direction by reciprocal lattice vectors.
在本文中，我们研究了来自随机占据的光学晶格的光的多重散射问题，从而扩展了前文的一阶玻恩分析。完整的多重散射分析对于全面理解光在介质内部的传播性质至关重要。我们的计算表明，当入射波与原子介质共振时，由于多重散射，它会迅速衰减。衰减常数严格取决于入射波长、晶格常数、原子的平均数密度及其极化率。多重散射的结果是，布拉格散射的振幅和方向都发生了改变。由于原本规则的晶格结构存在随机的格点占据情况，预计在与严格向后方向通过倒易晶格矢量相关的一组离散方向上，散射截面会出现相干增强。
