期刊
NANOPHOTONICS
卷 7, 期 3, 页码 677-682出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2017-0078
关键词
orbital angular momentum; fractional topological charge; optical vortex beam; diffraction
资金
- National Natural Science Fund for Distinguished Young Scholars [11525418]
- National Natural Science Foundation of China [11474048, 11374222, 91750201, 11774250]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
Zero-order and higher-order Bessel beams are well-known nondiffracting beams. Namely, they propagate with invariant profile (intensity) and carry a fixed orbital angular momentum. Here, we propose and experimentally study an anomalous Bessel vortex beam. Unlike the traditional Bessel beams, the anomalous Bessel vortex beam carries decreasing orbital angular momentum along the propagation axis in free space. In other words, the local topological charge is inversely proportional to the propagation distance. Both the intensity and phase patterns of the generated beams are measured experimentally, and the experimental results agree well with the simulations. We demonstrate an easy way to modulate the beam's topological charge to be an arbitrary value, both integer and fractional, within a continuous range. The simplicity of this geometry encourages its applications in optical trapping and quantum information, and the like.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据