ABSTRACT

The interaction between electromagnetic (EM) waves and plasma has been extensively investigated by the scattering-matrix method (SMM), but this method encounters the singularity problem, which is a numerical issue when the plasma density is considerable. In this study, the improved scattering-matrix method (ISMM) is applied to eliminate these singularities by adjusting the reference point in the calculation of the reflection coefficient and transmission coefficient. In addition, both the robustness and accuracy of the proposed method have been studied for the first time. The simulation results demonstrate that the ISMM not only inherits the superiority of SMM in terms of high efficiency but also exhibits stronger robustness and higher accuracy in dealing with different plasma characteristics, especially for high plasma densities. The reflectance, transmittance, and absorbance of terahertz waves propagation in an inhomogeneous plasma layer with different parameters, such as plasma density, thickness, collision frequency and external magnetic field, are then analyzed by the ISMM. These results are helpful in analyzing the effects of plasma on terahertz waves propagation and also provide a fundamental theoretical basis for the development of plasma physics.

摘要

电磁 (EM) 波与等离子体之间的相互作用已通过散射矩阵法 (SMM) 进行了广泛研究，但该方法遇到了奇异性问题，这是等离子体密度相当大时的数值问题。在这项研究中，改进的散射矩阵方法（ISMM）通过调整反射系数和透射系数计算中的参考点来消除这些奇异点。此外，首次研究了所提出方法的鲁棒性和准确性。仿真结果表明，ISMM不仅继承了SMM在高效率方面的优势，而且在处理不同等离子体特性，尤其是高等离子体密度时表现出更强的鲁棒性和更高的精度。反射率，然后由 ISMM 分析在具有不同参数（如等离子体密度、厚度、碰撞频率和外部磁场）的非均匀等离子体层中传播的太赫兹波的透射率和吸收率。这些结果有助于分析等离子体对太赫兹波传播的影响，也为等离子体物理学的发展提供了基本的理论基础。