Coupling Controlled Dual‐Band Tunable Electromagnetic Extraordinary Transmission in Graphene Hybrid Metasurfaces

Abstract

AbstractA metasurface is a kind of ultrathin artificial composite composed of subwavelength elements with unique abilities in manipulating electromagnetic waves. However, the static nature of its conventional metallic/dielectric constituent material has limited its fixed functionality in narrow frequency ranges. The two‐dimensional carbon sheet, i.e., graphene, is a promising platform for effectively tuning the functionality as well as operation frequency band of metasurface. Here, the authors propose and demonstrate a kind of graphene hybrid metasurface for dual‐band extraordinary electromagnetic transmission (EET). The metasurface is composed of two graphene/metal hybrid resonators with EET properties. It is shown that the EET of the graphene hybrid metasurfaces can be tuned by increasing the bias voltage on the graphene from 0 to 3 V. Furthermore, it is found that the transmission amplitude and operating frequency band of EET can be controlled by changing the relative position and thus the coupling of the two graphene hybrid resonators. The proposed design strategy of the hybrid metasurfaces is promising for many applications based on active EM or optical modulations.