In response to the growing demands of advanced 5G/6G communication technologies,millimeter-wave vortex beams have emerged as a promising solution to increase channel capacities.This paper introduces a novel and effici...In response to the growing demands of advanced 5G/6G communication technologies,millimeter-wave vortex beams have emerged as a promising solution to increase channel capacities.This paper introduces a novel and efficient method for vortex beam generation by leveraging the intrinsic singularities of dipole scatterers and enhancing their performance through non-local coupling.We demonstrate that the intrinsic singularities—amplitude-zero points in the scattering patterns of electric dipole(ED)and magnetic dipole(MD)resonances–enable the conversion of spin angular momentum(SAM)into orbital angular momentum(OAM),generating a vortex electric field distribution.By arranging these dipolar units into a periodic array,we establish a dual-resonance non-local metasurface that improves directivity and efficiency via non-local collective interactions and the generalized Kerker effect.This configuration significantly enhances forward scattering,producing highly directional vortex beams.Our experimental results show that the non-local metasurface achieves a vortex conversion efficiency approximately 2.2 times higher than that of a reference structure around 40 GHz.This alignment-free,high-efficiency solution offers great potential for expanding millimeter-wave communication capacity and advancing photonic applications.展开更多
基金supported by National Key R&D Program of China(No.2023YFA1406900 and No.2022YFA1404800)the National Natural Science Foundation of China(U22A2008,12404484)+2 种基金the Opening Funding of National Key Laboratory of Electromagnetic Space Security,and Laoshan Laboratory Science and Technology Innovation Project(No.LSKJ202200801)National Natural Science Foundation of China(No.12234007,No.12321161645)Sichuan Province Science and Technology Support Program(2025ZNSFSC0846).
文摘In response to the growing demands of advanced 5G/6G communication technologies,millimeter-wave vortex beams have emerged as a promising solution to increase channel capacities.This paper introduces a novel and efficient method for vortex beam generation by leveraging the intrinsic singularities of dipole scatterers and enhancing their performance through non-local coupling.We demonstrate that the intrinsic singularities—amplitude-zero points in the scattering patterns of electric dipole(ED)and magnetic dipole(MD)resonances–enable the conversion of spin angular momentum(SAM)into orbital angular momentum(OAM),generating a vortex electric field distribution.By arranging these dipolar units into a periodic array,we establish a dual-resonance non-local metasurface that improves directivity and efficiency via non-local collective interactions and the generalized Kerker effect.This configuration significantly enhances forward scattering,producing highly directional vortex beams.Our experimental results show that the non-local metasurface achieves a vortex conversion efficiency approximately 2.2 times higher than that of a reference structure around 40 GHz.This alignment-free,high-efficiency solution offers great potential for expanding millimeter-wave communication capacity and advancing photonic applications.
