Measuring the topological charge of a vortex beam via the self-rotating beam phase

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2024-09-09 DOI:10.1063/5.0221895

Shengxiang Shan, Shubo Cheng, Shuo Liu, Yan Xiong, Yiping Xu, Han Pan, Shaohua Tao, Wenxing Yang

引用次数: 0

Abstract

We proposed a method to measure the topological charge of a vortex beam by using the self-rotating beam phase in this Letter. We investigated the far-field intensity patterns of the vortex beams passing through a phase hologram of the self-rotating beam with n = +2 theoretically and experimentally. The results demonstrate that the far-field intensity patterns cannot exhibit bright stripes when the topological charge of the vortex is positive (i.e., n ⋅ l > 0) and the calculated ratio relationship ξ can be used to identify the topological charge of the vortex beam. Differently, it can be found that the far-field intensity patterns exhibit several bright stripes when the topological charge of the vortex is negative (i.e., n ⋅ l < 0) and the number N of the bright stripes is equal to |l|−1(l represents the topological charge of the vortex beam). The experimental results are in good agreement with the theoretical ones. This method may inspire further research in the field of self-rotating beams.

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通过自旋转束相测量涡旋束的拓扑电荷

在这封信中，我们提出了一种利用自旋转光束相位测量涡旋光束拓扑电荷的方法。我们通过理论和实验研究了通过 n = +2 的自旋转光束相位全息图的涡旋光束的远场强度模式。结果表明，当涡旋的拓扑电荷为正时（即 n⋅ l &;gt;0），远场强度模式不能表现出明亮的条纹，而计算出的比值关系ξ可用来识别涡旋束的拓扑电荷。与此不同的是，当涡旋的拓扑电荷为负时（即 n⋅ l < 0），远场强度模式会出现多条亮条纹，亮条纹的数量 N 等于 |l|-1（l 代表涡旋束的拓扑电荷）。实验结果与理论结果十分吻合。这种方法可能会对自旋转束领域的进一步研究有所启发。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.