基于FDTD亚波长金属孔径滤波器仿真分析

Simulation Study on the Filter of Sub-wavelength Metal Holes Arrays Based on FDTD

通过建立三维金属孔径模型,采用三维时域有限差分法(FDTD),对300～900nm波段内不同特征参数下的亚波长周期性金属孔径膜的透过率情况进行了仿真分析;运用FDTD solution软件得到了金属膜孔径、周期、厚度及孔径填充介质等参数影响下亚波长周期性金属孔径膜的波长与透过率对应曲线。结果表明,亚波长周期性金属孔径的透射系数随着孔径的增大而增大;随着孔径阵列周期的变大而减小;在金属前、后介质匹配时透射最强,这为制作光学滤波器奠定了基础。

Simulation analysis of transmission of light in sub-wavelength metal holes array diverse from 300-900 nm has been done through building a three-dimensional model and finite difference time domain method（FDTD）. The transmission is heavily influenced by variant characteristic parameters, such as radius, period, thickness and packing medium. At last some curves of wavelength and transmittance have been derived through FDTD solution software when parameters change. The results show that the transmittance become higher when radius is large, but the tendency is adverse to the period. The transmittance turns out to be the highest when the medium in front of the metal match the back, which lay the foundation for designing an optical filter.