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In this paper, we present a method to retrieve tensor polarizabilities ofgeneral bi-anisotropic particles from their far-field responses to plane-waveilluminations. The necessary number of probing excitations and the directionswhere the scattered fields need to be calculated or measured have been found.When implemented numerically, the method does not require any sphericalharmonic expansion nor direct calculation of dipole moments, but onlycalculations of co- and cross-polarized scattering cross sections for a numberof plane-wave excitations. With this simple approach, the polarizabilities canbe found also from experimentally measured cross sections. The method isexemplified considering two bi-anisotropic particles, a reciprocal omegaparticle and a non-reciprocal particle containing a ferrite inclusion coupledto metal strips.

Determining polarizability tensors for an arbitrary small electromagnetic scatterer