Spiral fractional vortex beams

A new type of spatially structured light field carrying orbital angular momentum (OAM) mode with any non-integer topological order, referred to as the spiral fractional vortex beam, is demonstrated using the spiral transformation. Such beams have a spiral intensity distribution and a phase discontin...

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Veröffentlicht in:Optics express 2023-02, Vol.31 (5), p.7813-7824
Hauptverfasser: Wu, Lixun, Feng, Xuankai, Lin, Zhongzheng, Wen, Yuanhui, Chen, Hongjia, Chen, Yujie, Yu, Siyuan
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container_end_page 7824
container_issue 5
container_start_page 7813
container_title Optics express
container_volume 31
creator Wu, Lixun
Feng, Xuankai
Lin, Zhongzheng
Wen, Yuanhui
Chen, Hongjia
Chen, Yujie
Yu, Siyuan
description A new type of spatially structured light field carrying orbital angular momentum (OAM) mode with any non-integer topological order, referred to as the spiral fractional vortex beam, is demonstrated using the spiral transformation. Such beams have a spiral intensity distribution and a phase discontinuity in the radial direction, which is completely different from an opening ring of the intensity pattern and an azimuthal phase jump, common features that all previously reported non-integer OAM modes (referred to as the conventional fractional vortex beams) shared. The intriguing properties of a spiral fractional vortex beam are studied both in simulations and experiments in this work. The results show that the spiral intensity distribution will evolve into a focusing annular pattern during its propagation in free space. Furthermore, we propose a novel scheme by superimposing a spiral phase piecewise function on spiral transformation to convert the radial phase jump to the azimuthal phase jump, revealing the connection between the spiral fractional vortex beam and its conventional counterpart, of which OAM modes both share the same non-integer order. Thus this work is expected to inspire opening more paths for leading fractional vortex beams to potential applications in optical information processing and particle manipulation.
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title Spiral fractional vortex beams
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