基于产生负介电常数的周期性金属线单元结构,利用平行金属双柱设计了具有双负通带的两种太赫兹波段二维左手材料。应用时域有限积分算法研究了二维左手材料的传输特性,仿真结果表明，在0.76 THz附近，平行金属双柱的表面电荷振荡与反向平行电流引发了电磁谐振，出现良好的负折射效应。 在0.75~0.78 THz之间同时具有负等效磁导率和负等效介电常数, 双负通带带宽约为0.03 THz。进一步研究了金属双柱间距、长度及基板厚度等结构参数对双负通带带宽的影响。研究结果为太赫兹波段左手材料的设计和研制提供了参考。

Negative permittivity can be realized from the periodic unit cells of the metallic bar structure. Two-dimensional left-handed material based on metal-rod pair structure is proposed. Propagation characteristics of two-dimensional left-handed material are studied by the time-domain finite integration method. Simulation shows that the structure has good left-handed property at the frequency of about 0.76 THz. Results indicate that this construction exhibits negative equivalent permittivity and permeability simultaneously in 0.75~0.78 THz, and the double negative pass band is 0.03 THz. Double negative pass band changing with structural parameter of metallic rod pairs is studied, indicating that it is related with the space between metallic rod pair, length and substrate thickness. The results provide a certain reference to design and study of left-handed material in terahertz range.