Fig. 1. Ring grating with a point source of incident light.点光源入射的环形光栅衍射图解

Fig. 2. Simulation results (light field inside the grating has been removed).Lumerical模拟结果(光栅内的光场已去除)

Fig. 3. Schematic diagram of virtual space(left) and physical space(right).虚拟空间(左)和物理空间(右)示意图

Fig. 4. For the grating with the inner diameter of 10 μm and the outter diameter of 10.1 μm (m=50, = 50 μm), (a) simulation results (light field inside the grating has been removed), and (b) comparison of self-image (dash line) and the light field at r = 10.1 μm (solid line). 对于内径为10 μm, 外径为10.1 μm, m = 50, = 50 μm的光栅, (a) Lumerical模拟结果(光栅内的光场已去除), 以及(b)自成像光场(短划线)与光栅处光场(实线)的对比

Fig. 5. For the grating with the inner diameter of 50 μm and the outter diameter of 50.1 μm (m=120, = 300 μm), (a) simulation results (light field inside the grating has been removed), and (b) comparison of self-image (dash line) and the light field at r = 10.1 μm (solid line). 对于内径为50 μm, 外径为50.1 μm, m=120, = 300 μm的光栅, (a) Lumerical模拟结果(光栅内的光场已去除), 以及(b)自成像光场(虚线)与光栅处光场(实线)的对比