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针对传统超材料的太赫兹响应调控难度大、程序复杂的缺点,提出调节超材料太赫兹响应特性的一种新方法.该方法是在传统三层超材料的结构与材料参数均不变的情况下,在中间介质层中引入一条附加的金属条,仅通过调节该金属条的位置和线宽,就能实现超材料对入射太赫兹波的响应频率、吸收峰值等的有效调节.结果显示,当附加金属条由底层向表层的方向移动时,超材料的响应频率红移.当金属条位于介质的中间位置时,超材料的吸收率达到最大(99.98%).而且,当金属条的线宽增大时,超材料的响应频率红移、吸收增强.此外,当太赫兹入射角≤45°时,该超材料的中心响应频率稳定、吸收率峰值较高.但是,当入射角>45°时,超材料的响应频率蓝移、吸收率峰值明显下降.根据这种新方法,能够对超材料的太赫兹响应进行有效控制,同时避免设计超材料结构的复杂过程.
Aiming at the shortcomings of terahertz control of traditional metamaterials, which is difficult and complex to program, a new method to adjust the terahertz response of metamaterials is proposed. This method is based on the fact that the structure and material parameters of the conventional three-layer metamaterials are invariable , An additional metal strip is introduced into the middle dielectric layer to effectively adjust the response frequency and the absorption peak of the incident meta-material to the incident terahertz wave just by adjusting the position and the line width of the metal strip.The results show that, When the additional metal strip moves from the bottom to the surface, the response frequency of the metamaterial is shifted to the red. When the metal strip is located in the middle of the medium, the absorption rate of the metamaterial reaches the maximum (99.98%). Moreover, When the width is increased, the response frequency of the metamaterial is redshifted and the absorption is enhanced.In addition, when the incident angle is less than or equal to 45 °, the center response frequency of the metamaterial is stable and the absorption peak value is high. However, when the incident angle is> 45 °, the response frequency of metamaterials is blue-shifted and the peak value of absorbance decreases obviously.According to this new method, the terahertz response of metamaterials can be effectively controlled while avoiding the complicated process of designing metamaterial structures.