采用三维时域有限差分法对单色平行光透过亚波长圆孔后的电磁场分布进行计算,计算距圆孔出射端口几个纳米范围内的瞬时光场分布,结果发现:虽然入射光沿y方向偏振,但由于介质的不连续性,在光的传播过程中产生分别沿、方向偏振的电场分量和;在与入射光偏振方向垂直的边缘处显示出明显的场增强现象。 Using the three-dimensional finite difference time-domain method, the distribution of the monochromatic parallel light after passing through the subwavelength circular aperture is calculated, and the instantaneous light field distribution within a few nanometers from the circular aperture exit port is calculated. The results show that: However, due to the discontinuity of the medium, the components of the electric field polarized in the direction of polarization are respectively generated during the propagation of light. The obvious field enhancement phenomenon is observed at the edge perpendicular to the polarization direction of incident light.