Bao Zhiyu, Tang Yang, Hu Zheng-Da, Zhang Chengliang, Balmakou Aliaksei, Khakhomov Sergei, Semchenko Igor, Wang Jicheng
School of Science, Jiangnan University, Wuxi 214122, China.
Departments of Optics and General Physics, Francisk Skorina Gomel State University, Sovetskaya Str. 104, 246019 Gomel, Belarus.
Nanomaterials (Basel). 2020 Jun 2;10(6):1102. doi: 10.3390/nano10061102.
In this paper, we propose a tunable coordinated multi-band absorber that combines graphene with metal-dielectric-metal structures for the realization of multiple toward perfect absorption. The parametric inversion method is used to extract the equivalent impedance and explain the phenomena of multiple-peak absorption. With the change of the Fermi level, equivalent impedances were extracted, and the peculiarities of the individual multiple absorption peaks to change were determined. By changing the structure parameters of gold rings, we obtain either multiple narrow-band absorption peaks or a broadband absorption peak, with the bandwidth of 0.8 μm where the absorptance is near 100%. Therefore, our results provide new insights into the development of tunable multi-band absorbers and broadband absorbers that can be applied to terahertz imaging in high-performance coordinate sensors and other promising optoelectronic devices.
在本文中，我们提出了一种可调谐的协同多频段吸收器，它将石墨烯与金属-电介质-金属结构相结合，以实现多频段近乎完美的吸收。采用参数反演方法提取等效阻抗，并解释多峰吸收现象。随着费米能级的变化，提取了等效阻抗，并确定了各个多吸收峰变化的特性。通过改变金环的结构参数，我们获得了多个窄带吸收峰或一个宽带吸收峰，其带宽为0.8μm，吸收率接近100%。因此，我们的结果为可调谐多频段吸收器和宽带吸收器的发展提供了新的见解，这些吸收器可应用于高性能坐标传感器中的太赫兹成像及其他有前景的光电器件。
