Broadband and high-efficiency photonic spin-Hall effect with all-metallic metasurfaces

In this paper, all-metallic reflective metasurfaces comprising S-shape streamline structures are proposed to achieve the photonic spin-Hall effect with average cross-polarization conversion efficiency exceeding similar to 84% in the range of 8-14 mu m. By comparing with all-metallic nanobricks, it is demonstrated that the electric field coupling could be enhanced by constructing a similar split ring resonator between adjacent unit elements to further improve its efficiency and bandwidth. As a proof of concept, the photonic spin Hall effect and spin-to-orbit angular momentum conversion could be observed by two metadevices with the maximum diffraction efficiency of similar to 95.7%. Such an all-metallic configuration may provide a plattbrm for various high-efficiency electromagnetic components, catenary optics, and practical applications. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

This paper proposes all-metallic reflective metasurfaces with S-shape streamline structures to achieve the photonic spin-Hall effect with high conversion efficiency and bandwidth. Experimental results demonstrate the effectiveness of this structure and its potential applications in high-efficiency electromagnetic components and optics.