Zhang Yi, Guo Xuyue, Han Lei, Li Peng, Liu Sheng, Cheng Huachao, Zhao Jianlin
Opt Express. 2017 Oct 16;25(21):25725-25733. doi: 10.1364/OE.25.025725.
We propose a common criterion for the effect of Gouy phase on the distinct polarization transition of focused vector vortex beams (VVBs). Such polarization transition is strongly dependent on the parity of the smaller modulus between VVB's polarization order and topological charge. Significantly, the cross polarization transitions are observed at areas where the two spin components with equi-intensity are exactly overlapping and the Gouy phase difference (GPD) between them equals to (2k + 1)π, k is an integer. As a whole, the focal field shows radially variant polarization distributions resulting from the unequal intensity proportion of the two spin components. This polarization transition holds potential in modifying the patterns of periodic surface structure induced by femtosecond vector beams.
我们提出了一种关于 Gouy 相位对聚焦矢量涡旋光束（VVBs）不同偏振转换影响的通用判据。这种偏振转换强烈依赖于 VVB 的偏振阶数和拓扑电荷中较小模的奇偶性。值得注意的是，在两个等强度的自旋分量完全重叠且它们之间的 Gouy 相位差（GPD）等于(2k + 1)π（k 为整数）的区域观察到了交叉偏振转换。总体而言，由于两个自旋分量的强度比例不相等，焦场呈现出径向变化的偏振分布。这种偏振转换在改变飞秒矢量光束诱导的周期性表面结构图案方面具有潜力。
