Fano-Resonance in Hybrid Metal-Graphene Metamaterial and Its Application as Mid-Infrared Plasmonic Sensor

• Main Authors: Jianfa Zhang, Qilin Hong, Jinglan Zou, Yuwen He, Xiaodong Yuan, Zhihong Zhu, Shiqiao Qin
• Format: Article
• Language: English
• Published: MDPI AG 2020-03-01
• Series: Micromachines
• Subjects: fano resonance; graphene; plasmonic sensor
• Online Access: https://www.mdpi.com/2072-666X/11/3/268

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 <inline-formula> <math display="inline"> <semantics> <mi mathvariant="sans-serif">&#956;</mi> </semantics> </math> </inline-formula>m/RIU and figure of merit (FOM) of about <inline-formula> <math display="inline"> <semantics> <mrow> <mn>158</mn> <mo>.</mo> <mn>7</mn> </mrow> </semantics> </math> </inline-formula>.