Scattering and enhancement of electromagnetic waves energy by coaxial plasma cylinders

Abstract

The scattering of plane electromagnetic waves by three configurations of coaxial plasma cylinders is investigated in perpendicular incidence.‏ The results show that the electromagnetic energy enhancement and redistribution of energy are significantly affected by plasma frequency, electron neutral collision frequency, incident wave frequency, and the configuration of coaxial plasma cylinders. With increasing the collision frequency at fixed plasma frequency and incident wave frequency, the maximum relative energy density of the focal spot increases, and with a further increase in the collision frequency, the maximum relative energy density of the focal spot reaches some maximum value and begins to decrease. Furthermore, for fixed values of collision and plasma frequencies, at incident frequencies where the focal length is large, the maximum relative energy density is small. One main result obtained in this research indicates that the energy enhancement at the focal spot for TM polarization scattering is more than for TE mode. The results of this paper may be used for applications related to the redistribution and enhancement of electromagnetic energy.