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Chin. Phys. B, 2020, Vol. 29(9): 094203    DOI: 10.1088/1674-1056/aba09d
Special Issue: SPECIAL TOPIC — Optical field manipulation
SPECIAL TOPIC—Optical field manipulation Prev   Next  

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

Lei Han(韩磊), Shuxia Qi(齐淑霞), Sheng Liu(刘圣), Peng Li(李鹏), Huachao Cheng(程华超), Jianlin Zhao(赵建林)
MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China
Abstract  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.
Keywords:  hybrid vector beam      polarization gradient      polarization mapping track      orbital angular momentum density  
Received:  17 May 2020      Revised:  20 June 2020      Published:  05 September 2020
PACS:  42.25.Ja (Polarization)  
  42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation)  
  42.50.Tx (Optical angular momentum and its quantum aspects)  
  42.40.Jv (Computer-generated holograms)  
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0303800), the National Natural Science Foundation of China (Grant Nos. 11634010, 61675168, 91850118, 11774289, and 11804277), the Fundamental Research Funds for the Central Universities, China (Grant No. 3102019JC008), and the Basic Research Plan of Natural Science in Shaanxi Province, China (Grant Nos. 2018JM1057 and 2019JM-583).
Corresponding Authors:  Sheng Liu, Jianlin Zhao     E-mail:  shengliu@nwpu.edu.cn;jlzhao@nwpu.edu.cn

Cite this article: 

Lei Han(韩磊), Shuxia Qi(齐淑霞), Sheng Liu(刘圣), Peng Li(李鹏), Huachao Cheng(程华超), Jianlin Zhao(赵建林) Hybrid vector beams with non-uniform orbital angular momentum density induced by designed azimuthal polarization gradient 2020 Chin. Phys. B 29 094203

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