摘要
推导了基于矢量德拜理论的径向偏振光通过两种介质分界面聚焦的三维电场矢量分布计算公式。将德拜理论计算的离焦平面电场分布作为入射源代入三维时域有限差分(FDTD)程序进行聚焦过程的仿真,其结果与用德拜理论计算的结果相一致。对于德拜理论无法计算的径向偏振光束通过半球形纳米孔聚焦问题,采用了设置介质结构灵活的FDTD进行仿真,观察并讨论了半球形纳米孔的焦移和场强增强现象。
The formulas of three-dimensional（3D）electric field of radially polarized beam focusing through the interface of two dielectric media are deduced based on the vectorial Debye theory.The electric field in a defocus plan calculated by Debye theory is introduced into 3D finite difference time domain（FDTD）program as input source for the simulation of focusing process.The FDTD simulation results agree well with that calculated by Debye theory.Due to its facility of setting the structures for different media,the FDTD method is applied for simulating the problem of radially polarized beam focusing through half ball shaped nano-holes which can not be calculated by Debye theory.The focus shift and field intensity enhancement phenomena caused by the half ball shaped nano-holes are observed and analyzed.
出处
《激光与光电子学进展》
CSCD
北大核心
2010年第10期113-116,共4页
Laser & Optoelectronics Progress
基金
广西制造系统与先进制造技术重点实验室开放课题(桂科能07109008_026_K)
广西科技厅科技攻关与产品试制(桂科攻0815001-6)资助课题
关键词
昱微
径向偏振光
矢量德拜理论
聚焦
纳米结构
microscopy
radially polarized beam
rectorial Debye theory
focusing
nano-structure
