Accurate Geometry Design of Magnetic Polariton With Specified Resonance Wavelength: A Combined LC Circuit Model and Inverse Technique

For enhancement of absorption and transmission at a specified wavelength using magnetic polariton (MP) resonance, it is necessary to determine the accurate geometry parameters at the corresponding resonance condition. In this work, the feature of the geometry design problem is analyzed and a method is presented for accurately determining the geometry parameters for specified MP resonance mode, which combines the LC circuit model for MP and inverse technique. The LC circuit model is used to give an initial rough design of geometric parameters and parameters range for the inverse algorithm. The particle swarm optimization (PSO) algorithm is used to minimize the objective function and determine the optimized geometric parameters. The forward problem to evaluate the objective function is solved using rigorous method. The presented method is demonstrated to have good performance in the geometry design of MP resonance structure using several example cases.