基于Dirac半金属和水的宽带太赫兹吸波体

Research on broadband terahertz absorber based on Dirac semi-metal and water mixture

本文提出了一种基于体Dirac半金属(BDS)和水的太赫兹(THz)双可调谐宽带超材料吸波体.与传统的单控吸振器不同,此吸波体可以通过温度和费米能级进行调节.模拟结果表明,当水和BDS的温度和费米能级分别调整在15℃和30 meV时,吸波体在2.97~6.11 THz频率范围内吸收率均大于90%.与没有注入水或没有BDS组件的吸波体相比,吸收率在90%以上的带宽有了明显提高.此外,通过调节水的温度或BDS的费米能量,吸波体的吸收带宽和强度可以独立或联合控制,而无需重新设计器件.利用水的介电常数可通过温度来调节的特性,以及BDS可通过费米能量来控制的特点,我们解释了双控吸波体的作用机理.本文采用场分析的方法来研究和阐明宽带吸收的物理机理.基于此吸波体优异的性能,本文的研究结果可能在热探测器和太赫兹成像领域有潜在的应用价值.

In this paper,a terahertz(THz)dual tunable broadband metamaterial absorber based on bulk Dirac semi-metal(BDS)and water is proposed.Unlike the traditional single-control vibration absorber,the vibration absorber can be adjusted by temperature and Fermi level.The simulation results show that when the water temperature and Fermi level of BDS are adjusted at 15℃and 30 meV,respectively,the absorption rate is greater than 90%in the frequency range of 2.97~6.11 THz.Compared with the absorber without water injection or BDS mode,the bandwidth with an absorption rate of more than 90%has been significantly improved.In addition,by adjusting the temperature of water or Fermi energy of BDS,the absorption bandwidth and intensity of the absorber can be controlled independently or jointly,without redesigning the device.We use the characteristic that the dielectric constant of water can be adjusted by temperature,as well as the characteristic that BDS can be controlled by Fermi energy,the action mechanism of the dual-control absorber is explained.In this paper,the physical mechanism of broadband absorption is studied and clarified by means of field analysis.Based on its excellent performance,our research results may have potential applications in the field of thermal detectors and terahertz imaging.