基于负微分电阻碳纳米管的太赫兹波有源超材料特性参数提取

摘要

A strategy is presented to acquire active terahertz (THz) metamaterial by incorporating negative differential resistance carbon nanotubes. Furthermore, we propose a method of extracting active metamaterial effective parameters. This new method can effectively solve the problems of signs and multi-branches, while the traditional parameter extraction method becomes powerless for active case. Our results indicate that the active THz metamaterial with metal wires array not only has negative value of the imaginary part of the permittivity but also presents magnetic-dispersion characteristics.%　　利用碳纳米管在外加静电场下可产生常温太赫兹频段负微分电阻的特性，提出了太赫兹波频段的有源超材料设计方法以及块状有源超材料等效电磁特性参数提取方法。对无源金属线阵进行参数提取，证明所提出的块状有源超材料等效电磁特性参数提取方法，可以有效解决传统参数提取中的符号与多分支选择问题。通过对嵌入具有负微分电阻特性的碳纳米管的金属线阵进行参数提取，发现太赫兹波有源超材料不仅具有等效介电常数虚部为负(代表电有源)的特性，而且还具有磁性色散的特性。