Fig. 1. Schematic diagram of the unit cell of metasurface: (a) Top view; (b) side view.超表面单元结构示意图　(a)顶视图; (b)侧视图

Fig. 2. Reflected phase and amplitude spectrum produced by linearly polarized light incident unit call: (a) Phase; (b) amplitude.线偏振光入射单元结构产生的反射相位和振幅谱　(a)相位谱; (b)振幅谱

Fig. 3. The phase and reflection amplitude of different corners simulated.仿真得到的不同转角的相位和反射振幅

Fig. 4. Reflective phase and amplitude spectra of unit cell structure under different rotation angle: (a) Phase spectra at LCP incident; (b) phase spectra at RCP incident; (c) amplitude spectra at LCP incident; (d) amplitude spectra at RCP incident.不同转角单元结构的反射相位和振幅谱　(a) LCP入射的相位谱; (b) RCP入射的相位谱; (c) LCP入射的振幅谱; (d) RCP入射的振幅谱

Fig. 5. Two kinds of metasurface structures for generating the vortex beam with topological charge numbers (a) l = 1 and (b) l = 2. 两种用于产生拓扑荷数分别为 (a) l = 1和(b) l = 2的涡旋波束超表面结构

Fig. 6. Reflective amplitude and phase distributions of vortex beams with l = 1 and l = 2 generated by metasurface. LCP incident l = 1 metasurface: (a) amplitude distribution and (b) phase distribution; RCP incident l = 2 metasurface: (c) amplitude distribution and (d) phase distribution. 超表面产生l = 1和l = 2的涡旋波束反射振幅和相位分布　LCP入射l = 1超表面的(a)振幅分布和(b)相位分布; RCP入射l = 2超表面的(c)振幅分布和(d)相位分布

Fig. 7. The amplitude and phase distribution of reflective vortex beam generated by the LCP incident l = 1 and l = 3 metasurface at different frequencies. l = 1: (a) amplitude distribution at 0.8 THz, (b) phase distribution at 0.8 THz, (c) amplitude distribution at 1.4 THz, (d) phase distribution at 1.4 THz. l = 3: (e) amplitude distribution at 1.1 THz, (f) phase distribution at 1.1 THz. 不同频率下l = 1和l = 3超表面产生的反射涡旋波束振幅、相位分布　 l = 1超表面(a) 0.8 THz频率下振幅分布, (b) 0.8 THz频率下相位分布, (c) 1.4 THz频率下振幅分布, (d) 1.4 THz频率下相位分布; l = 3超表面(e) 1.1 THz频率下振幅分布, (f) 1.1 THz频率下相位分布