通过附加金属条调节超材料的太赫兹响应  

Adjustment of terahertz response of a metamaterial by an additional metal strip

作　　者：姚洁[1] 许向东[1] 陈哲耕 戴泽林 李欣荣[1] 敖天宏[1] 范凯[1] 王蒙[1] 邹蕊矫 

机构地区：[1]电子科技大学光电信息学院电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《红外与毫米波学报》2016年第5期542-549,共8页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金(61071032;61377063;61235006;61421002)~~

摘　　要：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.Considering the difficulty and complexity in adjusting the terahertz（ THz） response of the traditional metamaterials（ M M s）,we proposed a novel method to adjust the THz response characteristics of M M s. Our M M s possess the same structural and material parameters as those of the traditional threelayer M M s,but differently,an additional metal strip is introduced in the middle dielectric layer.Through changing the position and line width of the additional metal strip,the response frequency and absorption for incident THz wave can be effectively adjusted. Results showthat if the additional metal strip moves from near the bottom metal to the surface metal,the response frequency is red shifted. If the additional metal strip is located in the middle of the dielectric layer,the absorption reaches maximum（ 99. 98%）. If the width of the additional metal strip is enlarged,the response frequency is red shifted,and the absorption is increased. In addition,if the incident angle is ≤45o,both the central response frequencies of the traditional and novel M M s remain stable,and their absorptions are high.However,if the incident angle is 45 o,their central response frequencies blue shift,and their absorptions decrease significantly. According to this novel method,the THz responses of M M s can be effectively adjusted,and the complex process for designing the M M structure can also be thus avoided.

关 键 词：超材料 太赫兹 响应频带 吸收频率 调控 

分 类 号：TB39[一般工业技术—材料科学与工程]