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本文设计了一种高灵敏度、高品质因子、高品质因数、高频探测、双固定功能的太赫兹可调完美吸收器。该吸收器可实现4 -14.5 THz范围内七个波段的完美吸收。在进行结构设计时，我们将线阵结构的参数与周期进行了关联。我们通过计算吸收器的相对阻抗来对器件宏观层面的电磁进行解释。并通过分析共振频率点的表面电场和磁场分布，来分析该器件的物理机制。我们计算了七个共振频点的品质因数，其中，最大Q值为219.41。通过改变外部折射率，我们发现该吸收器的灵敏度和FOM值最大可达5421.43 (GHz/RIU)和35.204 (1/RIU)。我们通过讨论关键参数对器件的影响，得出该器件可实现双固定性能的选择，七波段吸收以及全波段反射。通过改变狄拉克半金属的费米能级，证明该吸收器具有良好的动态调节能力。最后，我们通过改变外部电磁波的入射角发现该器件在中低频段具有良好的稳定性，但在高频段受外部入射角影响较大。我们所提出的吸收器在成像、探测、检测等领域具有巨大的应用潜力，相关工作对光电器件的设计提供了思路。This study introduces a tunable perfect absorber in the terahertz range based on Dirac semimetal nanowires, featuring high sensitivity, quality factor, and dual functionality. The absorber achieves perfect absorption across seven bands within the range of 0 - 14.5 THz: f1=5.032 THz (84.43%), f2=5.859 THz (96.23%), f3=7.674 THz (91.36%), f4=9.654 THz (99.02%), f5=11.656 THz (93.84%), f6=12.514 THz (98.47%), and f7=14.01 THz (97.32%). To ensure structural stability during design, the periodicity of the wire array structure was carefully considered. Verification of the absorber's performance was conducted through impedance matching calculations. Analysis of the surface electric and magnetic fields at resonance frequencies elucidates the underlying physical mechanisms governing the absorber's characteristics. Quality factors (Q) for the seven resonance points were computed, with a maximum Q of 219.41 observed. Further investigations by varying the external refractive index reveal maximum sensitivity and figure of merit (FOM) values of 5421.43 (GHz/RIU) and 35.204 (1/RIU), respectively. Then, by discussing the influence of key parameters on the device, we conclude that the device can achieve the choice of dual fixed performance. Dynamic modulation capabilities were demonstrated by varying the Dirac semimetal's Fermi energy (BDS). Additionally, examination of the device's angle of incidence dependence highlighted stable performance in the mid-low frequency range but cautioned about high-frequency range, necessitating careful consideration in practical applications. In conclusion, the proposed absorber holds significant promise for imaging, sensing, and detection applications, offering valuable insights for optoelectronic device design.
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Keywords:
- metamaterial /
- terahertz /
- Dirac semi-metal /
- electromagnetic multifrequency absorption /
- Fano resonance /
- tunable
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