Propagation Characteristics Of Terahertz Waves In Magnetized Dusty Plasma

When the aircraft passes through the atmosphere at high speed,due to the friction between the surface and the atmosphere,the air molecules will be ionized to form a layer of dusty plasma sheath.This layer of dusty plasma will absorb most of the energy of communication electromagnetic wave,causing communication interruption,which is the famous "blackout" problem.In order to alleviate this problem,the study of the interaction between electromagnetic wave and plasma has become a hot topic.With the rapid development of terahertz technology in this century,terahertz wave has become an effective method to solve the communication problem due to its advantages of low energy and high penetration.In addition,the real plasma and micron-sized charged dust particles coexist inseparably.The dust particles immersed in the plasma not only change the composition of the plasma,but also have an important impact on the propagation of electromagnetic waves in the plasma.But many studies have not considered the effects of dust particles.Based on the interaction between terahertz wave and magnetized dust plasma,the propagation characteristics of terahertz wave at vertical incidence and oblique incidence in magnetized dust plasma are studied by using analytical method and scattering matrix method respectively.The main contents and conclusions are as follows:Firstly,the propagation characteristics of vertically incident terahertz waves in magnetized dust plasma are investigated analytically.The calculated results show that the external magnetic field,plasma thickness,electron collision frequency,dust particle density and electron relaxation rate all affect the propagation of terahertz waves in the plasma.The right-handed circular-polarized(RCP)waves and left-handed circular-polarized(LCP)waves exhibit different propagation characteristics.When dust particles are not present,strong external magnetic field will cause the transmittance of RCP wave to produce transmittance valley in low frequency band.When dust particles exist,due to the effect of external magnetic field and dust particles,the transmittance peak will generate in the low frequency band of RCP wave,and increasing the density or radius of dust particles will increase the value of transmittance peak.For LCP waves,the transmittance increases monotonically with the increase of terahertz wave frequency regardless of the presence of dust particles.Secondly,The scattering matrix method(SMM)is used to study the propagation characteristics of oblique incident terahertz waves in magnetized dusty plasma.The effects of three different electron density distributions on the transmittance are analyzed on the basis of considering different incident angles.The results show that the uniformly magnetized dust plasma is more difficult to penetrate than the non-uniformly magnetized dust plasma when the incident Angle is the same,no matter RCP wave or LCP wave.When the electron density distribution is given,the transmittance of terahertz wave decreases with the increase of incident Angle.The presence of external magnetic field and dust particles will significantly affect the transmission of terahertz waves.Compared with RCP waves,the density of dust particles has little effect on LCP waves,and the stronger the magnetic field is,the more favorable the transmission of LCP waves.The research of this paper can provide a theoretical basis for alleviating the "blackout" problem.