Speckle patterns permit direct observation of phase breaking
Speckle patterns permit direct observation of phase breaking
复制标题
散斑图案允许直接观察相断裂
作者：
M. Kaveh;M. Rosenbluh;I. Freund
Aoderson 1和Mott 2表明，从一个强无序系统的散射定性地改变了电子波传播的方式。最近人们认识到，这些变化普遍发生在所有的波，特别是光波3 -5。同样明显的是，许多重要的新现象，以前间接推断的电子，现在可以直接观察到光子。在这里，我们展示了如何散射波的时间演化，由于非弹性相位破碎（退相）过程可以直接遵循。当相干光被无序系统散射时，出射波的图像以被称为散斑的明显随机强度交替的形式获得。从这个散斑图的时间演化中，我们发现多次散射大大减少了相位破坏所需的时间。这个意想不到的结果解释的极端脆弱性的阶段的长轨迹，似乎有重要的影响，各种各样的现象。
Aoderson1 and Mott2 showed that scattering from a strongly disordered system qualitatively changes the way in which electron waves propagate. It has recently been realized that these changes occur universally for all waves, in particular optical waves3–5. It is also becoming apparent that many important new phenomena previously inferred indirectly for electrons can now be observed directly for photons. Here, we show how the time evolution of the scattered wave due to inelastic phase breaking (dephasing) processes can be followed directly. When coherent light is scattered by a disordered system an image of the emergent wave is obtained in the form of an apparently random intensity alternation known as speckle. From the time evolution of this speckle pattern we have found that multiple scattering greatly reduces the time required for phase breaking. This unexpected result is explained in terms of the extreme fragility of the phases of long trajectories, and appears to have important implications for a wide variety of phenomena.