光子布朗多普勒频移对弱局域化相干后向散射锥的影响
Effect of the Photon's Brownian Doppler Shift on the Weak-Localization Coherent-Backscattering Cone
摘要：
我们报告的相干后向散射（CBS）增强锥与后向散射光子的频率的依赖性的第一次观察。实验是在扩散悬浮液中进行的，光的多普勒展宽是由散射体的布朗运动引起的。CCD照相机上的外差检测用于测量复场（即，全息图）以给定频率反向散射的光。全息图的分析产生后向散射光子的频率和传播方向。我们观察到，角CBS锥变得更窄的布朗谱的尾部。实验结果与一个简单的理论模型符合得很好。
英文摘要：
We report the first observation of the dependence of the coherent-backscattering (CBS) enhanced cone with the frequency of the backscattered photon. The experiment is performed on a diffusing liquid suspension and the Doppler broadening of light is induced by the Brownian motion of the scatterers. Heterodyne detection on a CCD camera is used to measure the complex field (i.e., the hologram) of the light that is backscattered at a given frequency. The analysis of the holograms yield the frequency and the propagation direction of the backscattered photons. We observe that the angular CBS cone becomes more narrow in the tail of the Brownian spectrum. The experimental results are in good agreement with a simple theoretical model.
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