Zhang Jianfa, Hong Qilin, Zou Jinglan, He Yuwen, Yuan Xiaodong, Zhu Zhihong, Qin Shiqiao
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China.
Micromachines (Basel). 2020 Mar 4;11(3):268. doi: 10.3390/mi11030268.
Fano resonances in nanostructures have attracted widespread research interests in the past few years for their potential applications in sensing, switching and nonlinear optics. In this paper, a mid-infrared Fano resonance in a hybrid metal-graphene metamaterial is studied. The hybrid metamaterial consists of a metallic grid enclosing with graphene nanodisks. The Fano resonance arises from the coupling of graphene and metallic plasmonic resonances and it is sharper than plasmonic resonances in pure graphene nanostructures. The resonance strength can be enhanced by increasing the number of graphene layers. The proposed metamaterial can be employed as a high-performance mid-infrared plasmonic sensor with an unprecedented sensitivity of about 7.93 μ m/RIU and figure of merit (FOM) of about 158 . 7 .
在过去几年中，纳米结构中的法诺共振因其在传感、开关和非线性光学方面的潜在应用而引起了广泛的研究兴趣。本文研究了一种混合金属 - 石墨烯超材料中的中红外法诺共振。这种混合超材料由包围着石墨烯纳米盘的金属网格组成。法诺共振源于石墨烯与金属等离子体共振的耦合，并且比纯石墨烯纳米结构中的等离子体共振更尖锐。通过增加石墨烯层数可以增强共振强度。所提出的超材料可以用作高性能中红外等离子体传感器，具有约7.93μm/RIU的前所未有的灵敏度和约158.7的品质因数（FOM）。
