光在偏振界面上的几何自旋霍尔效应
Geometric Spin Hall Effect of Light at Polarizing Interfaces
摘要：
当从相对于其传播方向倾斜的参考系观察光束时，光的几何自旋霍尔效应（几何SHEL）相当于偏振相关的位置偏移。受这一有趣现象的启发，光束的能量密度被分解为倾斜参考系中的笛卡尔分量。这说明了特性偏移的发生和检测器的有效响应函数的重要性。我们介绍了倾斜偏振界面的概念，并提供了一个方案，其实验实现。穿过这种界面的光束在倾斜的参考系中经历类似于原始几何SHEL的移位。这种位移是在偏振器处产生的，并且其发生不取决于检测系统的特性。我们给出了明确的结果，这种新型的几何SHEL，并表明，在掠入射这种效应相当于多个波长的位移，位移大于所介绍的古斯Hänchen和Imbert-Fedorov效应。
英文摘要：
The geometric Spin Hall Effect of Light (geometric SHEL) amounts to a polarization-dependent positional shift when a light beam is observed from a reference frame tilted with respect to its direction of propagation. Motivated by this intriguing phenomenon, the energy density of the light beam is decomposed into its Cartesian components in the tilted reference frame. This illustrates the occurrence of the characteristic shift and the significance of the effective response function of the detector. We introduce the concept of a tilted polarizing interface and provide a scheme for its experimental implementation. A light beam passing through such an interface undergoes a shift resembling the original geometric SHEL in a tilted reference frame. This displacement is generated at the polarizer and its occurrence does not depend on the properties of the detection system. We give explicit results for this novel type of geometric SHEL and show that at grazing incidence this effect amounts to a displacement of multiple wavelengths, a shift larger than the one introduced by Goos-Hänchen and Imbert-Fedorov effects.
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