三维FDTD方法对十字形红外带通滤波器的模拟

Simulation of Infrared Bandpass Filter Using Three-dimensional FDTD Method

通过Z变换技术联合Lorentz-Drude模型发展了三维时域有限差分(FDTD)算法,计算了在金膜上开十字叉结构的红外带通滤波器的频谱响应,为了生成不同的结构,使用Matalab环境的图形用户界面,用Fortran语言编写并运行了生成结构的模拟编码,模拟结果表明,随着十字叉的中心展宽,透过率将提高,在1.2μm时透过率接近80%。

In this research, we developed a three-dimensional finite-difference-time-domain algorithm that incorporated the Lorentz-Drude model through the use of Z-transform technique. This algorithm was used to compute the spectral response of inflared bandpass filters which consisted of the openings of cross-shaped structures in a thin gold film, In creating structures, a graphical user interface was built using Matlab development environment. The created structures were then simulated by running the simulation code written in Fortran. It was observed that cross-shaped structures with large center-broadening effect yielded the highest transmission intensity among the structures that were simulated. With a transmittance of approximately 80% at wavelength 1.2μm.