等离子体鞘套中太赫兹波传输特性研究

Studies on terahertz wave propagation in plasma sheath

摘要:

采用散射矩阵方法(SMM)研究太赫兹波在非磁化、非均匀等离子体鞘套中的传输特性。在假定等离子体电子密度分布为双指数分布条件下，对太赫兹波斜入射等离子体时的功率反射系数、透射系数及吸收系数进行了仿真，还对其随太赫兹波的入射角度、太赫兹波的频率、等离子体的碰撞频率、等离子体分布形态的变化规律进行了总结。研究结果表明，在上述条件下，太赫兹波在等离子体中均有较好的传输特性。总体上来说，随着太赫兹波频率的提高，太赫兹波在等离子体中的透射性更好，可以考虑提升载频至太赫兹波段来解决通信黑障问题。

Abstract:

The propagation characteristics of terahertz wave in non-magnetized and non-uniform plasma sheath are studied by the Scattering Matrix Method(SMM). The terahertz wave power reflection, transmission and absorption are simulated when the wave obliquely radiate the plasma, given that the electron density distribution of the plasma sheath is in double-exponential distribution. The variations of the terahertz wave power reflection, transmission and absorption with incident angle, terahertz frequency, plasma collision frequency and plasma distribution shape are summarized. The numerical results show that the terahertz wave has good propagation characteristics under these conditions. Overall, the transmittance of terahertz wave is better in plasma as its frequency increases, therefore, increasing the carrier frequency to terahertz band can be considered for solving blackout problem.