Abstract
Abstract In this paper, we present a new graphene plasmonic sensing structure and use the finite difference time domain method and also a graphene superconducting properties for counting the number of n-graphene layer, where 1 ≤ n ≤ 5. From the intensity change of the reflection of graphene plasmons excited at the boundary of graphene/white graphene layer, we can exactly estimate the number of graphene layers. The structure considered here supports surface plasmons whose dispersion properties can be harnessed by applying an electrical field to the graphene. By utilizing this feature, efficient coupling of the incident light to the surface plasmons of the structure is used for counting the number of graphene layer. Therefore, single layer graphene can be distinguished from double- and few-layer by efficient coupling condition. Also, the effects of the substrate of graphene on the reflection of the transverse electric and magnetic graphene plasmons are investigated. By applying a chemical potential of v g = 0.4 eV, a compact sensor with the footprint of 0.6 nm × 10 μ m × 20 μ m is achieved. Finally, experimental setup is used to verify and validate this numerical model with good results.
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