Faraday Rotation of Overdense Magnetized Plasma

Abstract

In this study, we investigate Faraday rotation of electromagnetic waves that are anomalously transmitted through an over-dense magnetized plasma layer. Here, magnetized plasma indicates that the plasma layer is immersed in a uniform magnetic field. Firstly, normally opaque over-dense magnetized plasma is shown to be transparent to obliquely incident electromagnetic waves. This high transparency can be achieved by providing conditions for resonant excitations of plasmonic modes. The resonant characteristics of the transmission coefficient of the considered structure are determined and discussed. The conditions under which the magnetized plasma behaves as a complete reflector are also obtained. Faraday rotation is shown to be enhanced under high transparency conditions. The reflected wave also exhibits Faraday rotation and is enhanced under total reflection conditions.

Transmission Matrix and Faraday Rotation in a Structure Composed of Over-Dense Magnetized Plasma, Dielectric, and Prism Layers

“…7. In comparison to our previous study, we observe that, in the absence of the prism, the maximum Faraday rotation angles for the transmitted wave occur at the incident angles which correspond to the maximum transmitted amplitudes, namely θ = 0.88 rad and θ = 2.3 rad [11], but while in presence of a prism, the Faraday rotation for the transmitted wave has only one peak, at θ = 1.2208 rad.…”

“…However, the electromagnetic waves are transmitted through the over-dense plasma only at resonant conditions of the excitation of the surface wave modes. The calculations in our previous paper [11] show that the presence of dielectric layers with 0 < Reε < 1 can provide these resonant conditions [12]. In this study, by adding two prisms to our previous structure, the restriction 0 < Reε < 1 is removed.…”

“…Welford et al used the mechanism of total internal reflection of a near boundary inhomogeneity of the dielectric permittivity to provide the required evanescent waves [10]. Diffraction gratings can also be used to produce evanescent waves [11]. One of these methods is the use of a dielectric layer.…”

“…The created coupled plasmons can then transfer the incident electromagnetic energy [6,8,12]. In our previous study, we used two dielectric layers, one on each side of a plasma, to produce evanescent waves [11]. However, to this end, the real part of the dielectric permittivity of the dielectric layer must be within the interval 0 < Reε < 1.…”

“…In this study, we add two prisms to our previous structure [11]. Because of the presence of a prism in this structure, the restriction on dielectric permittivity is removed.…”