空间波片偏振调制生成矢量光束的模拟研究

Simulation of the vector beams generated by the polarization modulation of the spatial variant wave-plate

摘要:

为了研究空间可变波片偏振调制生成矢量光束的方法，本文借助琼斯矢量和琼斯矩阵较深入地分析了任意阶拉盖尔-高斯螺旋光束通过空间偏振转换器件生成矢量光束的过程，并根据数学模型对矢量光束的远场强度分布进行了数值仿真. 仿真结果表明：线偏振和圆偏振的基模光束可分别通过空间半波片和空间四分之一波片转化生成矢量光束，且随着空间波片阶数的提高，输出光束暗核逐渐增大；空间波片对螺旋光束的作用可以等效为两个正交圆偏振的螺旋分量的叠加，通过轨道角动量偏振检测仿真，证实了该方法的正确性.

Abstract:

In order to study the generation of the vector beams by using the polarization modulation of the spatial variant wave-plate, the Jones vectors and Jones matrix are used to further discuss the process, in which an arbitrary Laguerre-Gaussian beam can be transformed into vector beam. Based on the mathematical mode, the far-field intensity distributions of the generated vector beams have been simulated by numerical method. The simulated results show that, the line-polarized and circularly polarized beams with basic mode can be converted to vector beams by using spatial variant half-wavelength plate and quarter wavelength plate respectively, and the dark core of the output beam increases with an increase of the order of the spatial variant wave-plate. The effects of the spatial variant wave-plate on the helical beams can be equivalent to the superposition of two mutually orthogonal circularly polarized helical beams. The polarization test of the orbital angular momentum confirms the practicability of this method.