Anderson localization of light

研究了随机介质中光散射的安德森局部化问题。胶乳对氦氖激光束进行散射，并观察到反向散射强度的增强。这是由于时间反转的光路。后向散射光的增强几乎是背景光强度的两倍。这种效应类似于电子安德森局域化。与电子的磁阻一样，后向散射的光强也受到时间反转项破缺的影响。我们研究了偏振的影响，发现在引入平行偏振器的情况下实现了最大的增强，而在引入横向偏振器的情况下实现了最小的增强。我们还发现了后向散射光强度在增强峰区域的波动。与峰的外部区域相比，这种波动很大。这种波动与大尺寸的散斑有关，表明在反向散射峰中存在较大的相干区。我们分析了这种波动的傅里叶分量，并研究了背向散射光强度的统计分布。光的安德森局域化与背向散射光强度的特定分布密切相关。我们还对固体随机散射体TiO_2进行了分析，并与液体乳胶散射体进行了比较，研究了强度的波动。

Anderson localization is investigated for light scattering in random medium. The latex scatters the laser beam of He-Ne and the enhancement of back scattering intensity has been observed. This is due to time reversed light path. The enhancement of the back scattering light becomes almost twice compared to the background intensity. This effect is similar to the electron Anderson localization. As same as the magnetoresistance of electron, the light intensity of back scattering is affected by the broken time reversal terms. We have investigated the effect of the polarization and found that the maximum enhancement is realized in the case of parrallel polarizer introduced and minimum for transvers case. We also have found that the fluctuation in the enhanced peak region of the intensity of back scattering light. This fluctuation is large compared to the outside region of the peak. This fluctuation is related to the speckle of the large size and it shows that the large coherent region in the bvack scattering peak. We analized the fourier components of this fluctuation and investigated the statistical distributuion of the intensity of back scattering light. The Anderson localization of light is shown to be closely related to the particular distribution of the intensity of back scattering litht. We also made analysis of the solid random scatterer TiO_2 and compared to the liquid latex scatterer and investigated the fluctuation of the intensity.