光的安德森局域化：与入射角的强相关性
Anderson localization of light: Strong dependence with incident angle
摘要：
研究了不同入射角下，光在由核壳结构纳米粒子（TiO2@SiO2）悬浮在乙醇溶液中组成的强无序光学介质中的传输.当入射角增加时，入射边界附近的光电导减小，吸收增加。我们将这种现象与输入边界附近的局域态密度增加（局域化增加）相关联，这可以通过随入射角的内反射的大幅增加来解释，这反过来又是局域化本身增强输入边界附近的有效折射率的直接结果。对于进入样品的光子测量的镜面反射显著低于相干反向散射光子在完全相反的方向上经历的有效内反射，表明光的非互易传播（镜面对称性破坏）。这项研究代表了一种新的方法，以了解复杂的物理过程中所涉及的强无序光学介质在接近本地化的临界制度。
英文摘要：
This paper studies the transport of light for different incidence angles in a strongly disordered optical medium composed by core-shell nanoparticles (TiO2@Silica) suspended in ethanol solution. A decrease of optical conductance and an increase of absorption near the input border are reported when the incidence angle is increased. We associated this phenomenon to an increase of the density of localized states (localization increase) near the input border, which could be explained by a large increase of internal reflection with the incidence angle, which in turn would be a direct consequence of the enhancement of the effective refractive index near the input border by localization itself. The specular reflection, measured for the photons that enter the sample, is considerably lower than the effective internal reflection undergone by the coherently backscattered photons in the exact opposite direction, indicating a non-reciprocal propagation of light (mirror-symmetry breaking). This study represents a novel approach in order to understand the complex physics involved in a strongly disordered optical medium at the critical regime of approaching localization.
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