Optimization of loss and gain multilayers for reducing the scattering of a perfect conducting cylinder
Yu Zhen-Zhong†, , Zhao Guo-Shu, Sun Gang, Si Hai-Fei, Yang Zhong
       

The total magnetic field distribution for the optimized low-loss gain-assisted multilayers (a) and for the low-loss multilayers without gain (b). The scattering width (c) normalized by wavelength for the PEC cylinder (solid), for the optimized low-loss multilayers with gain (dashed), and for the multilayers without gain (dotted).