Light Transport and Localization in Two-Dimensional Correlated Disorder
Light Transport and Localization in Two-Dimensional Correlated Disorder
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DOI：
10.1103/physrevlett.112.143901
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发表时间：
2014-04-07
影响因子：
8.6
通讯作者：
Wiersma, Diederik S.
中科院分区：
文献类型：
--
作者：
Conley, Gaurasundar M.;Burresi, Matteo;Wiersma, Diederik S.
无序介质中的结构相关性对波的传播有重要影响。在这封信中，我们从理论上研究了具有短程关联无序的二维光子结构中光的输运和局域化。这个问题是解决半解析使用的相关介质的结构因子的Baus-Colot模型和修改后的独立散射近似。我们发现，短程相关性使得它可以很容易地调整的运输平均自由程超过2的一个因素和相关的本地化长度超过几个数量级。这一趋势得到了时域有限差分数值计算的证实。因此，这项研究表明，无序工程可以提供精细的控制光传输和平面几何定位，这可能会打开新的机会，在基础和应用光子学研究。
Structural correlations in disordered media are known to affect significantly the propagation of waves. In this Letter, we theoretically investigate the transport and localization of light in 2D photonic structures with short-range correlated disorder. The problem is tackled semianalytically using the Baus-Colot model for the structure factor of correlated media and a modified independent scattering approximation. We find that short-range correlations make it possible to easily tune the transport mean free path by more than a factor of 2 and the related localization length over several orders of magnitude. This trend is confirmed by numerical finite-difference time-domain calculations. This study therefore shows that disorder engineering can offer fine control over light transport and localization in planar geometries, which may open new opportunities in both fundamental and applied photonics research.