Lee Ye-Ryoung, Choi Wonjun, Jeong Seungwon, Choi Wonshik
Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science, Seoul, 02841, Korea.
Department of Physics, Korea University, Seoul, 02841, Korea.
Sci Rep. 2019 Feb 26;9(1):2785. doi: 10.1038/s41598-019-39165-7.
In many complex physical phenomena such as wave propagation in scattering media, the process of interest often cannot be easily distinguished from other processes because only the total combined process is accessible. This makes it difficult to extract the precise knowledge of each subprocess. Here, we derive an analytic expression describing the way the eigenchannel coupling of the total process distributes its energy to the individual subprocesses, with only partial information on each subprocess such as the average eigenvalue 〈τ〉 and enhancement factor η. We found that the ratio of (η - 1)〈τ〉 between two subprocesses is a critical parameter determining the preferable subprocess in the energy coupling. This work provides a new analytic framework for understanding the effect of wavefront shaping in the control of wave propagation in disordered media.
在许多复杂的物理现象中，如散射介质中的波传播，由于只能获取总的组合过程，感兴趣的过程往往难以与其他过程轻易区分开来。这使得提取每个子过程的精确信息变得困难。在此，我们推导了一个解析表达式，该表达式描述了总过程的本征通道耦合将其能量分配到各个子过程的方式，其中仅包含每个子过程的部分信息，如平均本征值〈τ〉和增强因子η。我们发现，两个子过程之间(η - 1)〈τ〉的比值是决定能量耦合中更优子过程的关键参数。这项工作为理解波前整形在无序介质中波传播控制方面的作用提供了一个新的解析框架。
