Studying the possibility of extracting material parameters from reflection and transmission coefficients of plane wave for multilayer metamaterials based on metal nanogrids

To more adequately extract the effective refractive index and other so-called metamaterial parameters from the reflection and transmission coefficients of a wave for multilayer grid nanostructures in the near-IR spectral range, the Nicholson-Ross-Weir method was modified. The rate of convergence of each extracted metamaterial parameter to a certain limit is studied with increasing number of layers of the structure. For each frequency of the light field, this limit is obviously equal to the value of the parameter that corresponds to an infinite number of layers. The effect of a separation layer of a dielectric between pairs of grids on the convergence rate of extracted parameters is studied. Bulk electrodynamic parameters of the structure are discussed.