Study on the Absorption Properties of Terahertz Circularly Polarized Wave in FPL Model Fully Ionized Dusty Plasma

Abstract

In this article, Boltzmann’s general plasma kinetics and the Fokker–Planck–Landau (FPL) collision model of dusty plasma are used to obtain the expression of the dielectric coefficient of dusty plasma under the influence of an external magnetic field and the collision condition of the fully ionized FPL model. The charging effect of dusty plasma is fully considered. The absorption characteristics of circularly polarized waves in the terahertz band under different plasma parameters are calculated and analyzed by using the transfer matrix method. Results show that the intensity of the external magnetic field, the size and concentration of dust particles, the effective collision frequency and thickness of dusty plasma, the incidence angle of the electromagnetic waves, and the electron temperature greatly influence the absorption characteristics of circularly polarized electromagnetic waves. The propagation characteristics of circularly polarized waves caused by different external magnetic fields are evaluated. An absorption band is formed near the cyclotron frequency when the external magnetic field increases to a certain extent, and the direction of the electron cyclotron and the rotation direction of the polarized wave are consistent. The position and frequency band of dusty plasma can be controlled by artificially changing the magnitude of the external magnetic field. These results provide a theoretical basis for the study of electromagnetic wave propagation in weakly colliding, fully ionized dusty plasma and the propagation mechanism of an electromagnetic wave in the local high-temperature area of the hypersonic target.