In this study, we propose a dual-band wide-range tunable terahertz absorber based on graphene and bulk Dirac semimetal (BDS), which consists of a patterned BDS array, dielectric material, continuous graphene layer, and gold mirror. Simulation results show that the absorption at 3.97 and 7.94 THz achieve almost 100%. By changing the Fermi energy of graphene and BDS, the resonance frequency can be tuned between 3.97 and 9.28 THz. In addition, we found that when the background refractive index changes, the absorption is almost the same. This feature will broaden its applications. Finally, the influence of structural parameters and incident angles on device performance is discussed. The proposed absorber may have potential applications in photoelectric sensors and other optoelectronic devices.

中文翻译：

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基于石墨烯和狄拉克半金属的宽范围可调谐，双频带，本底折射率不敏感的太赫兹吸收器

在这项研究中，我们提出了一种基于石墨烯和体狄拉克半金属（BDS）的双频宽范围可调谐太赫兹吸收器，它由图案化的BDS阵列，介电材料，连续的石墨烯层和金镜组成。仿真结果表明，在3.97和7.94 THz处的吸收几乎达到100％。通过改变石墨烯和BDS的费米能量，可以将共振频率调整在3.97和9.28 THz之间。另外，我们发现，当背景折射率改变时，吸收率几乎相同。此功能将扩大其应用范围。最后，讨论了结构参数和入射角对器件性能的影响。提出的吸收器可能在光电传感器和其他光电设备中具有潜在的应用。