Fig. 1. Schematic illustration of the SOI for a light beam normally impinging onto a sharp isotropic interface. (a) When a left-circularly polarized beam normally passes through the interface, part of the incident beam converts into a right-circularly polarized beam, and carries a vortex phase with a topological charge of 2. Note that the spin-maintained portion is not shown in the picture. and denotes the left- and right-handed polarization, respectively. (b) Schematic illustration of rotational coupling between the local coordinates and the spin of the plane wave components within the beam spectra. The cone represents the angular spectrum of the beam. The two green arrows represent the wave vectors of arbitrary two plane waves. The orange circles with arrows indicate the projection of polarization vectors of each plane wave on the laboratory coordinates (all circularly polarized). is the spatial coordinate rotation. 光束正入射至各向同性的突变界面时SOI的示意图　(a) 左旋圆偏振光束正入射至界面后, 部分光束发生自旋反转变成右旋光, 并获得拓扑荷数为2的涡旋相位(两个小图分别表示一种典型的涡旋光束的强度和相位分布); 注意, 未发生SOI的那部分光束并没有在图中画出; 和 分别表示左、右旋圆偏振; (b) 光束中各平面波分量的自旋与局部坐标的旋转耦合的示意图, 其中圆锥代表光束的角谱, 绿色的箭头线代表任意的两支平面波的波矢, 橙色带箭头的小圆圈表示各平面的偏振矢量在实验室坐标上的投影(均为圆偏振), 为坐标旋转的空间旋转

Fig. 2. Normalized intensity distribution of the abnormal mode (a) and normal mode (b) of transmitted light beam under the normal incidence of a left-handed circularly polarized Bessel beam at a sharp interface. The insets represent the phase distribution of corresponding modes. Here, we take the working wavelength as and . 左旋圆偏振贝塞尔光束正入射至一个界面时, 透射光束的反常模式(a)和寻常模式(b)的归一化光强分布, 其中两个小图分别表示为对应的相位分布, 在计算中, 取入射光束的波长 且

Fig. 3. Transmission coefficients and conversion efficiency ( ) of three optically thin films placed in free space: (a) , (b) , (c) and , where we take and ; (d) conversion efficiencies versus and of a uniaxial layer with and ; (e) conversion efficiencies versus and h of a uniaxial layer with and . 三种放置于自由空间的单层薄膜材料的透射系数, 以及SOI的转换效率 　(a) , (b) , (c) 且 ; 计算中, 取入射光束的波长 , 三种材料厚度 ; (d)和(e)分别是 和 , 和h同时变化时的转换效率, 在(d)中, 取 , ; 在(e)中, 取 ,