碳纳米管非均匀氢等离子体微波吸收的数值模拟

Numerical Simulation for Microwave Absorption of Non-homogeneous Hydrogen Plasma in Carbon Nanotubes

提出碳纳米管非均匀氢等离子体薄膜的层状介电模型,探讨等离子体密度分布对碳纳米管氢等离子体微波吸收的影响,运用转移矩阵法求解电磁波的传播方程,计算不同条件下碳纳米管氢等离子体薄膜在0~30GHz频段的微波衰减系数。随着氢等离子体中自由电子密度分布非均匀性系数a的增加,微波衰减吸收峰值|Attmax|和强烈微波吸收的频宽均明显增大,吸收峰向高频方向移动。结果表明,增大等离子体密度分布的非均匀性,能显著改善碳纳米管氢等离子体薄膜的微波吸收性能。

A layered structure model is proposed for microwave dielectric property of non-homogene-ous hydrogen plasma in carbon nanotubes film.The influences of non-homogeneous density distribution of hydrogen plasma on microwave absorption of hydrogen plasma in carbon nanotubes films are investigated. Using the transfer matrix method for solving electromagnetic wave propagation equation,the microwave attenuation coefficients of the film are calculated in the frequency range of 0~30 GHz under different con-ditions.It is found theoretically that with the increase of hydrogen plasma non-homogeneity coefficients a, the maximum attenuation absorption|Att max|and the frequency bandwidth of strong microwave absorption by the film increases markedly.The absorption peak shifts towards the high frequencies withincreasing. The numerical results show that as the non-homogeneity degree of the hydrogen plasma increases,the ab-sorption of microwave energy will be enhanced in carbon nanotube films.