Semi-analytic technique for the polarizability extraction of chiral helix particles

In this paper, a consistent method for the polarizability matrix retrieval of chiral helix particles is presented. First, it is assumed that, under certain circumstances, the particle can be modelled by electric and magnetic dipoles placed on its shape center. Then, the chiral particles are positioned at a 2D array illuminated by plane waves, and dipole moments are analytically calculated as a function of polarizabilities and incident waves. The scattered fields from the same surface are, also, analytically computed as a function of dipole moments, while the resulting non-linear system is numerically solved for the desired polarizabilities. The proposed algorithm is verified by means of a chiral helix particle at microwave frequencies.