School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, China.
Opt Lett. 2011 Sep 1;36(17):3440-2. doi: 10.1364/OL.36.003440.
A theoretical model, novel to our knowledge, to investigate the near-field optical diffraction from a subwavelength aperture in a thin conducting film is presented. A governing equation for the magnetic field distribution in an optical thin film based on the power flow theorem is derived for the first time. Thus all of the components of the electric and magnetic fields inside or outside the thin film with a subwavelength aperture embedded can be obtained by applying the Hankel transform accurately. Numerical computations are performed to illustrate the edge effect by an enhancement factor of 2.2 and the depolarization phenomenon of the transmission in terms of the distance from the film surface.
提出了一种理论模型，用于研究在薄导电膜中的亚波长孔径的近场光衍射，该模型在我们的认知中尚属新颖。首次基于功率流定理推导出了光学薄膜中磁场分布的控制方程。因此，通过准确应用汉克尔变换，可以获得嵌入亚波长孔径的薄光学膜内外电场和磁场的所有分量。通过数值计算，说明了距离薄膜表面的距离对增强因子为 2.2 的边缘效应和传输的去极化现象的影响。
