Transverse localization of transmission eigenchannels
Transverse localization of transmission eigenchannels
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DOI：
10.1038/s41566-019-0367-9
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发表时间：
2019-05-01
期刊：
影响因子：
35
通讯作者：
Cao, Hui
中科院分区：
文献类型：
--
作者：
Yilmaz, Hasan;Hsu, Chia Wei;Cao, Hui
传输本征通道是扩散介质中相干波传输的基石，选择性激发单个本征通道可以导致不同的传输行为。一个重要的，但知之甚少的属性是每个本征通道的横向空间分布，这是相关的相关的能量密度和关键的耦合光进出it. Here，我们发现，传输本征通道的无序板具有指数本地化的入射和传出的配置文件，即使在远离安德森本地化的扩散制度。这种横向局部化是由互易性、空间模式的局部耦合和散射波的非局部相关性的组合引起的。实验上，我们观察到这样的本地化，即使在有限的照明区域的签名。高透射通道的横向局域化增强了混浊介质中的光能密度，这对于光-物质相互作用和成像应用将是重要的。
Transmission eigenchannels are building blocks of coherent wave transport in diffusive media, and selective excitation of individual eigenchannels can lead to diverse transport behaviour. An essential yet poorly understood property is the transverse spatial profile of each eigenchannel, which is relevant for the associated energy density and critical for coupling light into and out of it. Here, we discover that the transmission eigenchannels of a disordered slab possess exponentially localized incident and outgoing profiles, even in the diffusive regime far from Anderson localization. Such transverse localization arises from a combination of reciprocity, local coupling of spatial modes and non-local correlations of scattered waves. Experimentally, we observe signatures of such localization even with finite illumination area. The transverse localization of high-transmission channels enhances optical energy densities inside turbid media, which will be important for light-matter interactions and imaging applications.