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设计并制备了一种适用于太赫兹波段的非对称双开口环结构,数值仿真和实验测量了其传输性质。结果表明,垂直极化时样品在低频的0.540 THz和0.925 THz处存在谐振点,来源于左右两开口环的LC谐振,电流和电场分布主要集中在两开口环的开口处;而在高频处(1.885THz)谐振点的表面电流具有相反的两个环流方向,电流和电场分布于整个样品表面,此处的谐振来源于两开口环耦合后的偶极子谐振。当太赫兹波平行极化该样品时,原来两个低频的LC谐振消失。实验测量结果与数值仿真具有很好的一致性。此结构超材料的传输特性研究对太赫兹波调制器、滤波器、吸收器及偏振器等器件设计和制备具有一定的指导意义。
An asymmetric double-opening ring structure suitable for the terahertz band was designed and fabricated. Its transmission properties were measured by numerical simulation and experimentally. The results show that there are resonance points at low frequencies of 0.540 THz and 0.925 THz at vertical polarization. The LC resonance originates from the left and right split rings. The current and electric field distribution mainly concentrate on the openings of the two split rings. (1.885THz) The surface current of the resonance point has two opposite circulation directions. The current and the electric field are distributed over the entire sample surface. The resonance here comes from the dipole resonance after the two split ring couples. When terahertz waves parallel polarize the sample, the original two low-frequency LC resonances disappear. The experimental results are in good agreement with the numerical simulation. The research on the transmission characteristics of metamaterials has certain guiding significance for the design and fabrication of devices such as terahertz wave modulators, filters, absorbers and polarizers.