%0 Journal Article
%T Electromagnetic Scattering by Spheres of Topological Insulators
%A Lixin Ge
%A Dezhuan Han
%A Jian Zi
%J Physics
%D 2015
%I arXiv
%R 10.1016/j.optcom.2015.05.054
%X The electromagnetic scattering properties of topological insulator (TI) spheres are systematically studied in this paper. Unconventional backward scattering caused by the topological magneto-electric (TME) effect of TIs are found in both Rayleigh and Mie scattering regimes. This enhanced backward scattering can be achieved by introducing an impedance-matched background which can suppress the bulk scattering. For the cross-polarized scattering coefficients, interesting antiresonances are found in the Mie scattering regime, wherein the cross-polarized electromagnetic fields induced by the TME effect are trapped inside TI spheres. In the Rayleigh limit, the quantized TME effect of TIs can be determined by measuring the electric-field components of scattered waves in the far field.
%U http://arxiv.org/abs/1503.00235v1