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为克服传统时域有限差分法(FDTD)不能计算色散材料的困难,给出了一种基于Drude模型的色散FDTD算法,并推导出具体的差分公式。将该方法用于模拟金属透镜的聚焦功能,结果与已有理论吻合。本文方法完全适用于分析电导率与频率有关的各种色散材料所构建的光波导。
In order to overcome the difficulty that traditional FDTD can not calculate dispersion material, a dispersion FDTD algorithm based on Drude model is proposed and a specific differential formula is deduced. The method is used to simulate the focusing function of the metal lens, the result is consistent with the existing theory. The proposed method is well suited for the analysis of optical waveguides constructed of various dispersive materials related to conductivity and frequency.