This letter presents a scattered-field formulation for modeling dispersive media using the finite-difference time-domain (FDTD) method. Specifically, the auxiliary differential equation method is applied to Drude and Lorentz media for a scattered field FDTD model. The present technique can also be applied in a straightforward manner to Debye media. Excellent agreement is achieved between the FDTD-calculated and exact theoretical results for the reflection coefficient in half-space problems.

中文翻译：

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用于色散材料的 ADE-FDTD 散射场公式

这封信提出了使用有限差分时域 (FDTD) 方法对色散介质进行建模的散射场公式。具体而言，将辅助微分方程方法应用于 Drude 和 Lorentz 介质的散射场 FDTD 模型。本技术还可以以直接的方式应用于德拜媒体。对于半空间问题中的反射系数，FDTD 计算的结果与精确的理论结果之间实现了极好的一致性。