利用动力学相位和几何相位操控光自旋霍尔效应中的自旋分裂  

Manipulation of Spin Splitting in Spin Hall Effect of Light Based on Dynamic and Geometric Phases

作　　者：陈敏[1] 罗朝明[1] 万婷[1] 刘靖[1] 

机构地区：[1]湖南理工学院信息与通信工程学院,湖南岳阳414006

出　　处：《光学学报》2017年第2期248-255,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61205126);湖南省科技计划项目(2016TP1021);湖南省教育厅青年项目(2017)

摘　　要：从理论和实验角度,系统研究了基于动力学相位和几何相位来实现对光自旋霍尔效应中的自旋分裂的操控,利用推广的费马原理,理论上分析了这两类相位对光束传输行为的影响。结果表明,几何相位可以操控光束的自旋分裂,分裂的大小与超表面的空间旋转率有关,分裂的方向与几何相位的梯度方向一致。动力学相位能操控光束的整体平移,平移大小与动力学相位梯度相关,平移方向与动力学相位梯度的方向一致。基于空间光调制器和超表面搭建了一套实验系统,该系统证明了基于动力学相位和几何相位操控光自旋霍尔效应中自旋分裂方法的可行性。The manipulation of spin splitting in spin Hall effect of light based on the dynamic and geometric phases is systematically investigated from the theoretical and experimental standpoint. With the aid of the generalized Fermat principle, the influence of such two kinds of phases on beam propagation is theoretically analyzed. The results indicate that the spin splitting can be manipulated by the geometric phase, the size of the splitting is dependent on the space spin rate of meta-surface, and the splitting direction is coincided with that of the geometric phase gradient. The overall shift of light beam is manipulated by the dynamic phase, the size of the shift is dependent on the dynamic phase gradient, and the shift direction is consistent with that of phase gradient. An experiment system is established based on spatial light modulators and meta surfaces, and the possibility of realizing manipulation of spin splitting in spin Hall effect based on dynamic and geometric phases is experimentally confirmed.

关 键 词：物理光学 自旋霍尔效应 自旋相关分裂 动力学相位 几何相位 

分 类 号：O436[机械工程—光学工程]