Monolayer Chiral Metasurface for Generation of Arbitrary Cylindrical Vector Beams

• DOI: 10.3390/photonics11010057
• Publication Date: 2024-01-05T08:43:00Z
• Authors: Qian Chen; Peijun Liu; Yanan Fu; Shuoshuo Zhang; Yuquan Zhang; Xiaocong Yuan; Changjun Min
• Keywords: monolayer chiral metasurface; controllable polarization angle; Applied optics. Photonics; cylindrical vector beam; 02 engineering and technology; 0210 nano-technology; TA1501-1820

The cylindrical vector beam (CVB) has been widely studied and applied in recent years. However, many CVB generation methods suffer from complex systems, and large-size devices are required. Here, we propose a monolayer chiral metasurface composed of spin-sensitive unit cells which can generate different holograms for left- and right-circular polarization based on the combined modulation of geometric phase and detour phase. With a linearly polarized incident beam, the metasurface can generate CVBs with controllable polarization angles and orders, and even more complex vector beams. This work provides a new idea for the design of miniaturized optical devices for generating arbitrary vector beams.