激光与光电子学进展, 2010, 47 (10): 101801, 网络出版: 2010-09-20   

径向偏振光高数值孔径物镜聚焦的研究 下载: 505次

Study on Focusing of Radially Polarized Beam by High Numerical Aperture Objective
作者单位
1 桂林电子科技大学机电工程学院光机电一体化研究所, 广西 桂林, 541004
2 天津大学精密测试技术及仪器国家重点实验室, 天津, 300072
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。
Abstract
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.

高兴宇, 刘书桂. 径向偏振光高数值孔径物镜聚焦的研究[J]. 激光与光电子学进展, 2010, 47(10): 101801. Gao Xingyu, Liu Shugui. Study on Focusing of Radially Polarized Beam by High Numerical Aperture Objective[J]. Laser & Optoelectronics Progress, 2010, 47(10): 101801.

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