LAUSR

In this paper, a long column lens with a circular cross section made of two transversely non-isotropic dielectric parts covered by an isotropic plasma layer, is studied. The response of the mentioned object to the presence of plane monochromatic electromagnetic waves will be investigated. The finite element method has been used to calculate the field equations and the amplitudes of scattered waves in this research. This structure can be purposefully used as a device to focus electromagnetic wave energy in a specific area that its operation will be discussed by scattering theory. The electromagnetic responses of this structure have been simulated for two modes TE, TM of the incident wave, separately. Since in this lens a plasma region exists, the plasma can be considered as transparent or non-transparent states, with variations of plasma frequency in a fixed incident wave frequency. Here we consider the mentioned states too.