Abstract In this paper, we proposed and measured a metamaterial absorber with cross metal array in 12–28 THz range. A narrow absorption band (the absorption amplitude is 96%) is obtained at resonance frequency 19.24 THz, which is excited by the bright-bright modes coupling effect. Impedance matching is achieved at this resonance frequency between samples and free space. This absorption peak is enhanced and its resonance frequency is shifted with lattice constant reducing or structural parameter w1 increasing. The absorption peak is highly sensitive to the variation of structural parameters due to the bright-bright modes coupling effect on the cross strips. An equivalent LC circuit mode is proposed to understand the physical mechanism of the resonance frequency shifting. The effect of three gases on this absorption peak is measured. Moreover, high absorption performance is revealed when the incident angle reaches 480.

中文翻译：

---

太赫兹波段窄带超材料吸收体的设计与测量

摘要 在本文中，我们提出并测量了一种在 12-28 THz 范围内具有交叉金属阵列的超材料吸收器。在共振频率19.24 THz处获得了窄吸收带（吸收幅度为96%），这是由亮-亮模式耦合效应激发的。阻抗匹配是在样本和自由空间之间的共振频率下实现的。该吸收峰增强​​并且其共振频率随着晶格常数减小或结构参数w1增大而移动。由于交叉带上的亮-亮模式耦合效应，吸收峰对结构参数的变化高度敏感。提出了一种等效LC电路模式来理解谐振频移的物理机制。测量了三种气体对该吸收峰的影响。而且，