基于超材料结构的太赫兹吸收器的研究

Research on Terahertz Wave Absorber Based on Metamaterial

随着频谱的发展,太赫兹波在通信、检测等领域具有巨大的应用潜力.应用典型的三层结构,设计了一种呈现出多峰值的超材料太赫兹吸收器,超材料吸收器是由金属基板、匹配电介质层以及顶端超材料层组成.在该结构的基础上,改变结构尺寸,得到尺寸参数与吸收谱的关系.仿真结果表明,太赫兹波多频吸收器出现6个吸收率大于90%的吸收峰,其平均吸收率高达96.1607%,最高吸收率可达99.8891%,还发现对于4.43THz的频率点,其吸收率对于对称结构呈现出低吸收的情况,对于非对称结构呈现高吸收的情况.对于吸收器而言,相当于开关,当结构处于对称时,吸收器处于“闭”的状态,当吸收器处于非对称情况下,吸收器处于“开”的状态,实现了对太赫兹吸收器的调控.

With the development of spectrum,terahertz wave has great potential applications in communication,detection and other fields.In this paper,a multi-peak Terahertz metamaterial absorber is designed by using a typical three-layer structure.The metamaterial absorber consists of a metal substrate,a matched dielectric layer and a top metamaterial layer.At the same time,based on the structure,the relationship between the size parameters and the absorption spectrum is obtained by changing the structure size.The simulation results show that there are six absorption peaks,the average absorption rate is 96.1607%,and the maximum absorption rate is 99.8891%.Also found that for the 4.43 thz frequency points,the absorptivity of the absorber is low for the symmetrical structure and high for the asymmetrical structure,which is equivalent to a switch for the absorber.When the structure is symmetrical,the absorber is in the"closed"state,when the absorber is in the asymmetric condition,the absorber is in the"open"state,which realizes the adjustment and control of the terahertz absorber.