Structural stability of open vortex beams

Normally, intensity patterns of vortex beams are closed rings such as Laguerre–Gaussian beams and Bessel–Gaussian beams. Recent studies showed that the vortex beams with open ring structures, namely, open vortex beams (OVBs), have non-trivial orbital angular momentum (OAM) spectra and optical forces...

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Bibliographic Details
Published in:Applied physics letters 2021-10, Vol.119 (17)
Main Authors: Zeng, Ruoyu, Zhao, Qi, Shen, Yijie, Liu, Yidong, Yang, Yuanjie
Format: Article
Language:English
Subjects:
Angular momentum
Applied physics
Electron beams
Gaussian beams (optics)
Metrology
Quantum phenomena
Ring structures
Structural stability
Vortices
Wave packets
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Summary:Normally, intensity patterns of vortex beams are closed rings such as Laguerre–Gaussian beams and Bessel–Gaussian beams. Recent studies showed that the vortex beams with open ring structures, namely, open vortex beams (OVBs), have non-trivial orbital angular momentum (OAM) spectra and optical forces and can be employed in many applications such as metrology and quantum information. However, the structural stability of OVBs, including the topological charge conservation and the intensity invariance, has not been studied yet. Here, we theoretically propose a generalized model of OVBs, using both geometrical ray-like trajectories and coherent wave-packets, and the structural stability of OVBs is validated by the geometrical envelope of ray bundles. Moreover, we experimentally demonstrated that such OVBs can be generated by a partial fork-grating (PFG). Our study reveals structural characteristics of OVBs, which lays a foundation for the OVB's potential applications in optical manipulation, optical metrology, etc.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0062967