太赫兹波在磁化等离子体中传输特性

Terahertz wave propagation in magnetized plasma sheath

建立了电磁波穿过磁化等离子体鞘套的一维模型,并采用数值分析方法对太赫兹(THz)电磁波在磁化等离子体鞘套中传播时的反射率、透射率和衰减值进行了计算仿真,分析了磁化条件下磁场强度、太赫兹波频率、等离子体鞘套厚度、等离子体碰撞频率和等离子体密度对太赫兹波在磁化等离子体鞘套中传播特性的影响。仿真结果表明:排除衰减波峰对应的频率范围,外加磁场有效降低了太赫兹波传输的衰减,在固定磁场强度下,衰减波峰两侧的衰减值均达到了5dB以下,有效地解决了通信"黑障"问题。

There are few papers about terahertz wave propagating in magnetized plasma.Adding constant magnetic field around space crafts and choosing terahertz wave as communication signal are two effective ways to solve the famous 'blackout'problem.It is necessary to study the properties of terahertz wave propagation in magnetized plasma sheath.This paper has established the one-dimensional model to describe electromagnetic wave passing through the magnetized plasma sheath.A numerical analysis method is adopted to calculate the reflection coefficient,transmission coefficient and attenuation coefficient of the terahertz wave propagating in magnetized plasma sheath.The variations of the terahertz wave propagation properties with the terahertz wave frequency,plasma density,plasma collision frequency,the thickness of the plasma and magnetic field intensity are acquired.The simulation shows that the magnetic field effectively reduces the attenuation when the terahertz wave propagates in plasma sheath.Except the peak value of the attenuation,the value is less than 5dB.This phenomenon shows that the communication'blackout'problem is solved effectively.The result can be used as reference for designing hypersonic vehicles with magnetic window antenna using terahertz wave as communication signal.