Interaction of Terahertz wave with plasma based on Z-FDTD
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摘要: 利用Z变换时域有限差分法(Z-FDTD)计算等离子体鞘层中太赫兹(THz)波的传输特性，得出太赫兹波的功率反射和透射系数在等离子鞘层中随电磁波频率的变化曲线图，分析了太赫兹波的传输特性与等离子体结构参数(鞘层厚度、碰撞频率以及电子密度)的关系，对利用太赫兹波缓解等离子体鞘层通信中出现的“黑障”现象做了探讨。结果表明：太赫兹波能改善等离子体鞘层通信，为解决“黑障”问题提供了有效途径。
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关键词:
- Z变换时域有限差分法 /
- 太赫兹波 /
- 等离子体鞘层 /
- 黑障
Abstract: Using the Z transform finite difference time domain method (Z-FDTD), we calculated Terahertz wave's transmission characteristics in plasma sheath, acquired the Terahertz wave power transmission and reflection coefficients with the change of the EM frequencies in the plasma sheath, analyzed the relationship of Terahertz wave transmission characteristics and plasma structure parameters (sheath thickness, collision frequency and the electron density), and discussed the method of using Terahertz wave to solve the "blackout" phenomenon. The results show that Terahertz wave can improve the communication in plasma sheath and provide an effective way to solve the "blackout" problem.-
Key words:
- Z-FDTD /
- Terahertz wave /
- plasma sheath /
- blackout
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图 2 一维FDTD中场分量差分迭代
Figure 2. Difference iteration of field component in one-dimensional FDTD
图 6 不同碰撞频率下的透射系数
Figure 6. Transmission coefficients at different collision frequencies
图 9 不同等离子体厚度下的反射系数等离子体(电子密度为1021 m-3)
Figure 9. Reflection coefficients at different plasma thickness (electron density is 1021 m-3)
图 10 不同等离子体厚度下的透射系数等离子体(电子密度为1021 m-3)
Figure 10. Transmission coefficients at different plasma thickness (electron density is 1021 m-3)
图 11 不同等离子体厚度下的反射系数等离子体(电子密度为1020 m-3)
Figure 11. Reflection coefficients at different plasma thickness (electron density is 1020 m-3)
图 12 不同等离子体厚度下的透射系数等离子体(电子密度为1020 m-3)
Figure 12. Transmission coefficients at different plasma thickness (electron density is 1020 m-3)
图 13 不同等离子体碰撞频率下的反射系数
Figure 13. Reflection coefficients at different collision frequencies
图 14 不同等离子体碰撞频率下的透射系数
Figure 14. Transmission coefficients at different collision frequencies
图 15 不同等离子体厚度下的反射系数
Figure 15. Reflection coefficients at different plasma thickness inhomogeneous plasma
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