Xu Kai, Yang Yanfang, He Ying, Han Xiaohong, Li Chunfang
Department of Physics, College of Science, Shanghai University, Shanghai 200444, China.
J Opt Soc Am A Opt Image Sci Vis. 2010 Mar 1;27(3):572-7. doi: 10.1364/JOSAA.27.000572.
Beams of non-uniform elliptical polarization distribution have been obtained in real time from a radially or an azimuthally polarized beam by using a liquid crystal variable retarder (LCVR), which can be modulated by varying the applied voltage. The local polarization states analyzed by the Stokes parameters strongly depend on the spatial position and the phase retardation angle of the LCVR. The angular momentum of the beams varies in each quadrant, where the polarization rotated direction for the radially polarized beam through the LCVR is right-handed in the first quadrant and the third quadrant, while it is left-handed in the second quadrant and the fourth quadrant. However, the polarization rotated direction for the azimuthally polarized beam through the LCVR is the inverse of that for the radially polarized beam.
通过使用液晶可变延迟器（LCVR），可以实时从径向或方位角偏振光束中获得非均匀椭圆偏振分布的光束，该延迟器可通过改变施加的电压进行调制。由斯托克斯参数分析的局部偏振态强烈依赖于LCVR的空间位置和相位延迟角。光束的角动量在每个象限中变化，其中通过LCVR的径向偏振光束的偏振旋转方向在第一象限和第三象限中是右旋的，而在第二象限和第四象限中是左旋的。然而，通过LCVR的方位角偏振光束的偏振旋转方向与径向偏振光束的相反。
