On the modeling of small wire scatterers with core

A simple model for chiral wire scatterers with core is presented. The model reduces the (isotropic) core of the scatterer to its dipole moments. The r esulting description of the electromagnetic problem allows a simple calcula tion of the complete dipole polarizability tensors of the scatterer. For sp herical cores the theoretical results obtained from the model are compared with the exact solution. Measurements performed on single helices without a nd with spherical or cylindrical core show that the model allows a reliable characterization of scatterers with arbitrarily shaped core.