Boosting numerical accuracy in calculation of polarizability of two-dimensional scatterers

This article presents an effective way to increase the accuracy of the numerical evaluation of the polarizability of two-dimensional scatterers. It is based on the numerical exploitation of the observation that the polarizabilities of complementary inclusions are closely related: if the permittivity is inverted, the polarizability changes sign. For anisotropic inclusions, the corresponding property cross-connects the orthogonal components, and can be used as well in the numerical calculations. The improvement of the numerical accuracy is several orders of magnitude. The method is also applied to evaluate the polarizability of split rings.