Fig. 1. (a) Schematic for basic unit structure; (b) and (c) phase response of different length (l) and width (w) of the dielectric column under x- and y- LP incident beams; (d) phase difference between the x- and y-polarized light for different length (l) and width (w) of the dielectric column; (e) relationship between the rotation angle of the dielectric column and the additional phase. (a)单元结构示意图; (b)与(c) x与y方向线偏振入射光相位响应与介质柱长(l)、宽(w)之间的关系; (d) x和y方向上的相位差随l和w变化关系; (e)介质柱的旋转角与附加相位关系图.

Fig. 2. (a) Schematic diagram of the 2D optical edge detection; (b) phase gradient of the LHCP and RHCP component after the P-B phase matesurface; (c) diagram of the metasurface; (d) and (e) wavefront changes of RHCP and LHCP plane waves through the metasurface.(a)光学二维边缘检测原理图; (b) LHCP与RHCP通过PB相位超表面后获得的相位梯度变化; (c) P-B相位超表面示意图; (d)和(e) RHCP与LHCP平面波通过超表面后波前变化图

Fig. 3. (a) The mask used in the simulation; (b)−(d) the result of 1D edge extraction when the periodT = 4 mm, 2 mm, 1 mm; (e)−(g) the result of 2D edge extraction when the periodT = 4 mm, 2 mm, 1 mm. (a) 深圳大学校徽掩模板; (b)−(d)周期T = 4 mm, 2 mm, 1 mm时, 一维边缘检测效果; (e)−(g)周期T = 4 mm, 2 mm, 1 mm时二维边缘检测效果

Fig. 4. (a) Mask patterns of different squre; (b)−(d) metasurface fast-axis distributions and phase distributions of LHCP after metasurface; (e)−(g) results of the edge extraction with different Metasurface fast-axis distributions; (h)−(j) phase difference distributions of LHCP and RHCP at 0.1 m transmission distance.(a)形状不同的正方形掩膜板; (b)−(d)超表面的快轴分布以及LHCP通过超表面后的相位分布; (e)−(g)不同光轴分布的超表面实现边缘提取效果; (h)−(j)经过传输距离为0.1 m后LHCP和RHCP的相位差分布

Fig. 5. Spatial spectral transfer function of the optical axis distribution functions with different power exponent in the x- and y- direction respectively. 幂指数不同的光轴分布函数分别在x与y方向上的空间传递函数