Modal analysis of graphene microtubes utilizing a two-dimensional vectorial finite element method

Salonikios, Vasileios; Amanatiadis, Stamatios; Kantartzis, Nikolaos V.; Yioultsis, Traianos V.

doi:10.1007/s00339-016-9862-8

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…The graphene material can be characterized by effective index defined as n eff = 𝛽/ k 0 , where k 0 is the wave number in free space. As for transverse magnetic (TM) mode, the propagation constants of SPPs supported by a single-layer graphene, can be expressed as [49,50,51,52]

β = k_{0} \sqrt{1 - {(\frac{2}{η_{0} σ_{g}})}^{2}}

where η 0 (377 Ω) is the intrinsic impedance of the free space. As far as band structure calculations are concerned, it is generally sufficient to consider the wave vector k around the edge of the irreducible Brillouin zone (IBZ: form Г to X to M ) while ignoring the inner region, which can be justified from the symmetry of the structure.…”

Section: Simulation Methods and Modelsmentioning

confidence: 99%

Investigation of the Band Structure of Graphene-Based Plasmonic Photonic Crystals

Qiu

Lin

et al. 2016

Nanomaterials

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In this paper, one-dimensional (1D) and two-dimensional (2D) graphene-based plasmonic photonic crystals (PhCs) are proposed. The band structures and density of states (DOS) have been numerically investigated. Photonic band gaps (PBGs) are found in both 1D and 2D PhCs. Meanwhile, graphene-based plasmonic PhC nanocavity with resonant frequency around 175 THz, is realized by introducing point defect, where the chemical potential is from 0.085 to 0.25 eV, in a 2D PhC. Also, the bending wvaguide and the beam splitter are realized by introducing the line defect into the 2D PhC.

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β = k_{0} \sqrt{1 - {(\frac{2}{η_{0} σ_{g}})}^{2}}

Section: Simulation Methods and Modelsmentioning

confidence: 99%

Investigation of the Band Structure of Graphene-Based Plasmonic Photonic Crystals

Qiu

Lin

et al. 2016

Nanomaterials

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“…However, it should be noted that the optical properties or optical waves in graphene have also been investigated [34][35][36][37][38][39][40][41]. This work shows an analogy between the electron wave nature in graphene electronics and the electromagnetic waves in dielectrics.…”

Section: Introductionmentioning

confidence: 99%

Guided Modes in a Double-Well Asymmetric Potential of a Graphene Waveguide

Ang

2016

Electronics

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Abstract:The analogy between the electron wave nature in graphene electronics and the electromagnetic waves in dielectrics has suggested a series of optical-like phenomena, which is of great importance for graphene-based electronic devices. In this paper, we propose an asymmetric double-well potential on graphene as an electronic waveguide to confine the graphene electrons. The guided modes in this graphene waveguide are investigated using a modified transfer matrix method. It is found that there are two types of guided modes. The first kind is confined in one well, which is similar to the asymmetric quantum well graphene waveguide. The second kind can appear in two potential wells with double-degeneracy. Characteristics of all the possible guide modes are presented.

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Efficient adjustment of finite graphene scattering properties via magnetic-bias control for advanced beam manipulation

et al. 2020

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In the present work, the scattering of an incident plane wave due to magnetically-biased graphene patches is thoroughly investigated at millimeter-wave and THz bands. Initially, the surface conductivity of graphene is evaluated at these spectral regions and a finite layer is placed perpendicular to the propagation of an incident plane wave. Then, the radar cross-section, at a plane normal to graphene, is numerically extracted and the anisotropic effects due to the magnetostatic bias Lorentz forces on electrons, reveal the influence of gyrotropy and magnetoplasmon excitation on the back-scattered wave. Specifically, the directivity of the latter is calculated as a function of the magnetostatic field considering a couple of electrostatic biases and frequencies. As expected, stronger fields are enabling graphene gyrotropic behaviour, while the propagating surface waves increase the edge effects of the finite sheet. Finally, the extracted results from the previous analyses are evaluated appropriately to design combinations of graphene patches, of different magnetic-bias fields in order to investigate the potential of advanced beam manipulation potential. The outcome of this part is promising since the variation of bias fields is able to adjust considerably the main-lobe direction of the back-scattered field. All numerical results are extracted via an accurate modification of the popular Finite-Difference Time-Domain scheme.

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Modal analysis of graphene microtubes utilizing a two-dimensional vectorial finite element method

Cited by 6 publications

References 25 publications

Investigation of the Band Structure of Graphene-Based Plasmonic Photonic Crystals

Investigation of the Band Structure of Graphene-Based Plasmonic Photonic Crystals

Guided Modes in a Double-Well Asymmetric Potential of a Graphene Waveguide

Efficient adjustment of finite graphene scattering properties via magnetic-bias control for advanced beam manipulation

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