Hybrid vector beams with non-uniform orbital angular momentum density induced by designed azimuthal polarization gradient

• 作者: Huachao Cheng Jianlin Zhao Lei Han Peng Li Sheng Liu Shuxia Qi
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2020,（9）
• 所属期刊栏目: SPECIAL TOPIC—Optical field manipulation
• 页码范围: 140-147
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/aba09d

摘要

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.Geometrically,the configured azimuthal polarization gradient is indicated by intriguing mapping tracks of angular polarization states on Poincaré sphere,more than just conventional circles for previously reported vector beams.Moreover,via tailoring relevant parameters,more special polarization mapping tracks can be handily achieved.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.These peculiar features may open alternative routes for new optical effects and applications.