We report on an auxiliary field approach for solving nonlinear eigenvalue problems occurring in nano-optical systems with material dispersion. The material dispersion can be described by a rational function for the frequency-dependent permittivity, e.g., by a Drude-Lorentz model or a rational function fit to measured material data. The approach is applied to compute plasmonic resonances of a metallic grating.

中文翻译：

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一种用于计算色散介质中光学共振的辅助场方法

我们报告了一种辅助场方法，用于解决在具有材料色散的纳米光学系统中发生的非线性特征值问题。可以通过针对频率的介电常数的有理函数（例如，通过Drude-Lorentz模型）或适合于所测量材料数据的有理函数来描述材料色散。该方法被应用于计算金属光栅的等离子体共振。