A method for generating double-ring-shaped vector beams

• 作者: 余华清 凌晓辉 吕昊 易煦农 李钱光 陈欢 陈知红
• 来源期刊: 中国物理B（英文版）
• 关键词: vector beam Pancharatnam-Berry phase element geometric phase
• 年，卷（期）: 2016,（7）
• 页码范围: 074201-1-074201-5
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/25/7/074201

摘要

We propose a method for generating double-ring-shaped vector beams. A step phase introduced by a spatial light modulator (SLM) first makes the incident laser beam have a nodal cycle. This phase is dynamic in nature because it depends on the optical length. Then a Pancharatnam–Berry phase (PBP) optical element is used to manipulate the local polarization of the optical field by modulating the geometric phase. The experimental results show that this scheme can effectively create double-ring-shaped vector beams. It provides much greater fl exibility to manipulate the phase and polarization by simultaneously modulating the dynamic and the geometric phases.