The cylindrical column lenses and reflectors made of transverse an-isotropic plasma and dielectrics and their response to presence of plane electromagnetic waves

چکیده مقاله

In this paper, a long column lens with circular cross section made of two transversely non-isotropic parts (dielectric and plasma ) covered by isotropic dielectric layer, is studied. The response of the mentioned object to presence of plane monochromatic electromagnetic waves will be investigated. The finite element method (FEM) have been used to calculate the field equations and the amplitudes of scattered wave 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 electromagnetically responses of this structure have been simulated for two modes TE, TM of the incident wave, separately. Since in this lens a plasma region exist, therefore 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.