Electromagnetic model of a nanodipole array above a double‐layer graphene by periodic green's function. Issue 15 (30th October 2020)

• Record Type: Journal Article
• Authors: Cruz, André; Costa, Karlo; Dmitriev, Victor; Souza, Nadson; Zaman, Quaid; Del Rosso, Tommaso
• Is Part Of: IET microwaves, antennas & propagation. Volume 14:Issue 15(2020)
• Page Start: 2088
• Page End: 2096
• Publication Date: 2020-10-30
• Subjects: plasmonics -- graphene -- surface impedance -- surface plasmon resonance -- Green's function methods -- nanostructured materials -- chemical potential -- surface conductivity; nanodipole array -- double‐layer graphene -- graphene layers -- dielectric mediums -- surface impedances -- Kubo model -- electromagnetic fields -- spectral representation -- periodic Green's function -- impedance condition -- equivalent model -- analytical electromagnetic model -- surface plasmon resonance sensor -- terahertz frequency -- finite element method -- spatial analyses -- spectral parametric analyses -- C; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2020.0161
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : In this study, the authors present an electromagnetic model of a nanodipole array above a double‐layer Graphene (DLG) operating at Terahertz. The graphene layers deposited between the dielectric mediums are modelled as surface impedances with conductivities described by the Kubo model. The electromagnetic fields are defined by the spectral representation of the periodic Green's function with impedance condition between the mediums. The main objective of this work is to propose an equivalent and analytical electromagnetic model of a nanodipole array above a DLG, which can be used to describe a surface plasmon resonance sensor that operates at the terahertz frequency. As a way of validating the method, the authors compared the proposed model with a software based on the finite element method. In addition, still, as a form of validation, the authors verified the convergence of the method from the spectral analysis of the proposed Green's Function. As results, spatial and spectral parametric analyses are shown as a function of the concentration of nanodipoles in the array, and the chemical potential applied to the graphene layers. In these results, the authors verify the appearance of plasmonic, optical and acoustic modes, and their contributions in the total field.