基于狄拉克半金属超表面的太赫兹调制技术研究

Terahertz modulation technology based on Dirac semimetal metamaterial

本文设计了一种非对称双开口环超表面结构的狄拉克半金属太赫兹谐振器,并研究分析了结构参数与费米能级对共振幅度的影响。研究结果表明,随着对称缺损程度的增加,谐振器的共振峰逐渐红移,共振幅度呈现先增加再减少的趋势。随着狄拉克半金属材料费米能级的增加,谐振器的共振峰幅值增加。当费米能级在40-200meV时范围变化时,在0.38 THz附近实现了99.4%的幅值调制深度,在太赫兹波调控方面有很好的应用价值。

In this article,we designed a Dirac semimetal metamaterial resonator in terahertz with an asymmetric double open loop metasurface structure.It Can be applied in amplitude modulation of terahertz frequency band.The study compared the influence of structural parameters and Fermi level on resonance amplitude.The results indicate that as the degree of symmetry defect increases,the resonance peak of the resonator gradually shifts red,and the resonance amplitude shows a trend of first increasing and then decreasing.As the Fermi level of Dirac semimetal metamaterial increases,the resonance peak amplitude of the resonator increases.When the Fermi level is 200meV,a 99.4%amplitude modulation depth is achieved near 0.38 THz.