Laser & Optoelectronics Progress, Volume. 62, Issue 15, 1526001(2025)
Hybrid Phase Concentric Generalized Perfect Vortex Metasurface (Invited)
Due to the spatial constraint of arrayed vortex beams, the number of practically applicable orbital angular momentum (OAM) eigenstates remains finite. To address this limitation, this paper incorporates the generalized focusing phase and circular domain function into the vortex phase design, fabricating a vortex phase metasurface based on α-Si nanoantennas. The experimental results demonstrate the successful generation of concentric generalized perfect vortex beams (G-PVBs). This novel design transcends the constraint of conventional vortex beam symmetry, featuring distinct vortex shapes and spiral lobes in the beam pattern, with spiral interference patterns arranged concentrically without overlap. The approach effectively decouples the shape, topological charge, number of vortex beams, and polarization characteristics. Each vortex beam maintains stable topological charge and shape information, successfully preventing intermodal crosstalk. Through this efficient concentric configuration, this research achieves spatial multiplexing, polarization multiplexing, and OAM mode multiplexing of perfect vortex beams. This advancement expands the communication channels and information dimensions in vortex beam communications, offering significant potential for high-capacity encrypted vortex beam communication systems.
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Gaodi Chen, Xiaoxu Deng. Hybrid Phase Concentric Generalized Perfect Vortex Metasurface (Invited)[J]. Laser & Optoelectronics Progress, 2025, 62(15): 1526001
Category: Physical Optics
Received: Apr. 21, 2025
Accepted: Jun. 3, 2025
Published Online: Jul. 2, 2025
The Author Email: Xiaoxu Deng (xxdeng@sjtu.edu.cn)
CSTR:32186.14.LOP251054