Based on angular amplitude modulation of orthogonal base vectors in common-path interference method, we propose an interesting type of hybrid vector beams with unprecedented azimuthal polarization gradient and demonstrate in experiment. Distinct to previously reported types, the synthetic hybrid vector beams exhibit geometrically intriguing projection tracks of angular polarization state on Poincare sphere, more than just conventional circles. More noteworthily, the designed azimuthal polarization gradients are found to be able to induce azimuthally non-uniform orbital angular momentum density, while generally uniform for circle-track cases, immersing in homogenous intensity background whatever base states are. Moreover, via tailoring relevant parameters, more special polarization mapping tracks can be handily achieved. These peculiar features may open alternative routes for new optical effects and applications.

中文翻译：

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由设计的方位极化梯度引起的具有非均匀轨道角动量密度的混合矢量光束

基于共径干涉法中正交基矢量的角幅度调制，我们提出了一种有趣的混合矢量光束，具有前所未有的方位极化梯度，并在实验中进行了演示。与之前报道的类型不同，合成混合矢量光束在庞加莱球上表现出几何上有趣的角偏振态投影轨迹，而不仅仅是传统的圆。更值得注意的是，发现设计的方位极化梯度能够诱导方位角非均匀轨道角动量密度，而对于圆轨道情况通常是均匀的，无论基态如何，都沉浸在均匀强度背景中。此外，通过定制相关参数，可以轻松实现更多特殊的偏振映射轨迹。