磁导率近零太赫兹超材料设计的仿真分析

Simulation Analysis on Design of Permeability-near-Zero Terahertz Metamaterials

提出了一种以金属-电介质复合结构为基本单元的磁导率μ近零的太赫兹超材料。在太赫兹波垂直入射的情况下,当电场为横磁偏振时,在1.44THz谐振频率附近,可得到μ实部的最优值为0,μ近零的带宽(|μ|<0.05)约为0.2THz;当电场为横电偏振时,在0.978THz谐振频率附近,得到μ实部的最优值为0,μ近零的带宽(|μ|<0.05)约为0.1THz。在固定的几何参数下,通过改变偏振方向可以实现该超材料在不同频段内的近零效果。分析了聚酰亚胺介质层厚度、金属层数以及入射角度对磁导率近零效果的影响,并讨论了该结构的容差范围。

A kind of terahertz metamaterial with a near-zero magnetic permeability（μ）which uses a metal-dielectric composite structure as the basic unit cell is proposed.Under the condition that the terahertz wave is incident perpendicularly,the optimal value of the real part ofμis 0 near the resonance frequency of 1.44 THz with a bandwidth（｜μ｜〈0.05）of about 0.2 THz when the electric field is transverse-magnetic polarized.However,when the electric field is transverse-electric polarized,the optimal value of the real part ofμis 0 near the resonance frequency of 0.978 THz with a bandwidth（｜μ｜〈0.05）of about 0.1 THz.Under the fixed geometric parameters,theμ-near-zero effect can be achieved in different frequency bands via the adjustment of polarization direction.The influences of the thickness of polyimide dielectric layer,metal layer number,and incident angle on theμ-near-zero effect are analyzed,and the tolerance error range of this structure is discussed.