Abstract-Terahertz waves propagation through an inhomogeneous collisional magnetized plasma slab

Z. Rahmani, H. Morad

http://www.sciencedirect.com/science/article/pii/S0030402617312780

Propagation of terahertz waves through an inhomogeneous collisional magnetized plasma layer is studied. The plasma has bell-like electron density distributions, but collision frequency is constant. The transmission, reflection and absorption of s-polarized wave obliquely incident on the plasma slab, are found using the impedance matching method. Here the external magnetic field is uniform and its direction is perpendicular to inhomogeneity direction and parallel with the plasma surface. The effects of the incident wave characteristics, such as frequency of the electromagnetic wave and its incident angle, and plasma parameters, such as the inhomogeneity coefficient, cyclotron frequency and collision frequency on transmission, reflection and absorption are investigated.

Abstract-Terahertz electromagnetic wave generation and amplification by an electron beam in the elliptical plasma waveguides with dielectric rod

Z. Rahmani^1,a), B. Jazi¹ and E. Heidari-Semiromi²
http://scitation.aip.org/content/aip/journal/pop/21/9/10.1063/1.4896718
1 Department of Laser and Photonics, Faculty of Physics, University of Kashan, Kashan, Iran
2 Department of Condense Matter, Faculty of Physics, University of Kashan, Kashan, Iran
a) z.rahmani@kashanu.ac.ir

The propagation of electromagnetic waves in an elliptical plasma waveguide including stronglymagnetized plasma column and a dielectric rod is investigated. The dispersion relation of guided hybrid electromagnetic waves is obtained. Excitation of the waves by a thin annular relativistic elliptical electron beam will be studied. The time growth rate of electromagnetic waves is obtained. The effects of relative permittivity constant of dielectric rod, radius ofdielectric rod, accelerating voltage, and current density of the annular elliptical beam on the growth rate and the frequency spectra are numerically presented.