Investigating the reduction of cross-polarized Gaussian beam scattering from a PEMC buried cylinder coated with a topological insulator

摘要

An investigation is presented for the reduction of cross-polarized Gaussian beam scattering from a perfect electromagnetic conducting (PEMC) cylinder coated with topological insulator (TI) material and buried in a semi-infinite medium. To calculate the successive reflections of the scattered field from the interface, cylindrical wave functions are written into the spectrum of plane waves. The scattered reflected field is calculated for each plane wave of the spectrum. Near- and far-zone scattered fields are reported for time-reversal symmetry and symmetry-broken TI coating. It is observed that the near-zone scattered field is very helpful to understand why the scattering width (SW) of a cylinder coated with time-reversal symmetry TI material is different from the SW of a cylinder coated with symmetry-broken TI material. The effect of spot size of the Gaussian beam on the scattering pattern is investigated, while the result for a plane wave is served as a reference. It is observed that cross-polarized scattering can be reduced by increasing the thickness of the coating layer. It also decreases as admittance of the PEMC core increases. Moreover, the cross-polarized scattered field becomes significantly small when time-reversal symmetry is broken, irrespective of PEMC or perfect electric conductor (PEC) core. (C) 2018 Optical Society of America