磁化冷等离子体球的太赫兹散射特性

基于位函数的引入与介质参量无关,将各向异性目标内外的电场展为级数形式,得到了任意各向异性目标n阶散射场、目标内场的递推表达式,给出了介电常量张量的变换关系,在平面波任意入射的条件下,并给出了传播单位矢量与极化单位矢量的一般关系.以磁化冷等离子体为例,给出了一阶散射场的具体表达式,并对二阶散射场引起的误差进行了评估.在THz波段和光波段,对所得结果进行了部分仿真.结果表明:微分散射对电波频率和极化状态等因素的影响较为敏感,介电常量张量的非对角元素对散射的影响不大,当波长与目标尺寸一定时,仿真结果不仅适用于THz波段,对其它波段也成立.

THz Scattering Property for a Magnetized Cold Plasma Sphere

Based on that the potential functions and medium parameter are irrelative and expanding the electric fields inside & outside the anisotropic medium target into series, the nth order expressions both of scattering field from an anisotropic medium target and its inner elelctric field are developed. The transformation of the dielectric constant tensor is presented. When a plane electromagnetic wave incident in arbitrary direction, a general relation between the unit vector in propagation and that in polarization is expressed. Taking the magnetized cold plasma as an example, the first order scattering is developed and the error induced by the second order field is evaluated. In the THz wave band and optical wave band, the obtained result is simulated. Simulation results show that the differential scattering change sensitively with operating frequency and the polarization etc.; the non diagonal elements of the tensor have no influence on the scattering; when the wave length and the size of the target are given, the simulations are correct in THz wave band and validate in other wave band.