Reduced absorpton and beam broadening of transmission from LHM surfaces with exponential correlation functions

Abstract

In this paper, the absorption, scattering, and transmission from exponentially correlated rough surfaces of left-handed materials (LHM) are studied numerically. Numerical results are illustrated show that the presence of the second opposite transmission from lower medium to upper one for exponentially correlated LHM surfaces dramatically reduces the absorptions and enhances the bistatic scattering remarkably. In particular, the exponentially correlated roughness has negative effect on absorption for TE case. Then all absorptivities for TE case are below that of the planar interface, and decrease continuously with the increasing roughness. Due to both the Brewster angle effect and the opposite transmission, the absorptivities for TM case of LHMs increase at first and decrease subsequently down below that of the planar interface. Both polarimetric absorptive characteristics are in completely contrary to those of the right-handed materials (RHMs), where the absorptivities for both TE and TM cases are monotonic increasing with the increase of roughness because of its fine-scale surface's features and the increasing effective surface areas. In addition, the beam of transmission is broadened compared with that of RHM.