Han Chen, Zhong Renbin, Liang Zekun, Yang Long, Fang Zheng, Wang Yiqing, Ma Anchen, Wu Zhenhua, Hu Min, Liu Diwei, Liu Shenggang
Terahertz Research Centre, School of Electronics Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China.
Cooperative Innovation Center of Terahertz Science, University of Electronic Science and Technology of China, Chengdu 610054, China.
Materials (Basel). 2021 Jan 8;14(2):284. doi: 10.3390/ma14020284.
This paper reports an independently tunable graphene-based metamaterial absorber (GMA) designed by etching two cascaded resonators with dissimilar sizes in the unit cell. Two perfect absorption peaks were obtained at 6.94 and 10.68 μm with simple single-layer metal-graphene metamaterials; the peaks show absorption values higher than 99%. The mechanism of absorption was analyzed theoretically. The independent tunability of the metamaterial absorber (MA) was realized by varying the Fermi level of graphene under a set of resonators. Furthermore, multi-band and wide-band absorption were observed by the proposed structure upon increasing the number of resonators and resizing them in the unit cell. The obtained results demonstrate the multipurpose performance of this type of absorber and indicate its potential application in diverse applications, such as solar energy harvesting and thermal absorbing.
本文报道了一种独立可调谐的基于石墨烯的超材料吸收器（GMA），它是通过在单元胞中蚀刻两个尺寸不同的级联谐振器来设计的。利用简单的单层金属-石墨烯超材料，在6.94和10.68μm处获得了两个完美吸收峰；这些峰的吸收值高于99%。从理论上分析了吸收机制。通过改变一组谐振器下方石墨烯的费米能级，实现了超材料吸收器（MA）的独立可调谐性。此外，通过在单元胞中增加谐振器的数量并调整其尺寸，观察到了该结构的多波段和宽带吸收。所获得的结果证明了这种类型吸收器的多功能性能，并表明了其在太阳能收集和热吸收等各种应用中的潜在应用。
