The negative refractive index metamaterials as the aggregate of spherical particles or porous disposed in the different ambient medium

摘要

The possibility to achieving the negative refraction by the system of the identical and homogenous spherical particles or porous implanted in the arbitrary ambient medium has been studied. The effective permeability and effective permittivity is investigated applying Mie scattering theory and Clausius-Mossotti expressions. It is shown that the magnetic and electric dipole resonance of the scattering field can not simultaneously occur in such system However, the simultaneous effective negative permittivity and effective negative permeability could be achieved in non resonance case. Possible range of the parameters of the particles, the porous and the media is established for the different frequencies of electromagnetic fields. The existence of the negative refraction for the system with noble metals (gold, silver) as a substance of the particles or of the surrounded medium is considered.