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%。

Simulation of Infrared Bandpass Filter Using Three-dimensional FDTD MethodWANG Lin~1,ZHANG Lin~1,ZHOU Jian~2,QIANG Rui~3,CHEN Ji~3 (1.School of Information Engineering,Wuhan University of Technology,Wuhan 430070,China;2.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;3.Department of Electrical and Computer Engineering,University of Houston,Housten,USA)In this research,we developed a three-dimensional finite-difference-time-domain algorithm that incorporated the Lorentz-Drude model through the use of Ztransform technique.This algorithm was used to compute the spectral response of infrared 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 1.2 μm.FDTD;infrared bandpass filter;three-dimensional simulation