A method for analyzing the electromagnetic reflection and transmission characteristics of graphene in a wide frequency band
An analysis method, graphene technology, applied in instrumentation, computer material science, informatics, etc., can solve problems such as difficulty in describing graphene's broadband dispersion characteristics, multiple differential meshes, etc., to save time and memory, and improve dispersion characteristics. Effect
Active Publication Date: 2020-08-11
NANJING UNIV OF SCI & TECH
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Problems solved by technology
However, for the ultra-thin and electrically large-scale structure of graphene, the traditional finite-difference time-domain method will encounter the disadvantage of too many differential grids in order to accurately simulate its electromagnetic properties.
In addition, the existing numerical calculation methods only support the calculation of graphene under the simple conductivity model, and it is difficult to describe the broadband dispersion characteristics of graphene
Method used
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Embodiment 1
[0117] In order to verify the correctness and effectiveness of the method in this paper, a numerical example is given below to verify the validity of the theory and program. The program is compiled in Fortran language and executed on a Windows 7 64-bit system, 16GB memory, 3.7GHz main frequency personal computer, and the CPU model is Intel(R) Core TM i3-4170.
[0118] Such as Figure 4 The graphene patch with periodic cross structure shown, the period of its unit is p=60um, L=48um, d 1 = d 2 =6um; the scattering rate of graphene Γ=0.5meV, the bias electric field E=2V / nm; the incident wave adopts modulated Gaussian pulse, and its center frequency is f 0 =1THz, the pulse width is tw=2, the frequency range of the source is 0.1THz~2THz, the plane wave is incident along the z-axis positive direction, the polarization direction of the electric field is along the x-axis direction; the subdivision size is dx=dy=dz =2um, the number of layers of PML is 20, and the total grid number ...
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Abstract
The invention discloses a method for analyzing electromagnetic reflection and transmission characteristics of graphene under a broadband. The method comprises the following steps: firstly, establishing an electromagnetic wave time domain finite difference equation based on a generalized thin layer transmission condition; secondly, extracting an electric polarizability tensor and a magnetic polarizability tensor of the graphene material under the broadband, and fitting the electric polarizability tensor and the magnetic polarizability tensor of the broadband by adopting a complex conjugate pole residue pair method; combining the fitted polarizability tensor with an electromagnetic wave time domain finite difference method based on generalized thin layer transmission condition to obtain an update equation of the polarization current density and polarization magnetic current density and an update equation of the electric field intensity and magnetic field intensity on graphene; and finally, carrying out differential iteration, solving the electric field intensity and the magnetic field intensity in a computational domain, and obtaining the reflection coefficient and transmission coefficient by using discrete Fourier transform. The method provided by the invention saves the time and memory of analysis and operation of graphene electromagnetic reflection and transmission characteristics, and has high flexibility and effectiveness.
Description
technical field [0001] The invention belongs to the technical field of numerical calculation of target electromagnetic reflection and transmission characteristics, in particular to an analysis method of graphene electromagnetic reflection and transmission characteristics under broadband. Background technique [0002] Graphene is a two-dimensional planar single-layer structure composed of carbon atoms arranged in a honeycomb lattice. Its thickness is only 0.34nm, which is the thinnest material known in the world. As a new type of two-dimensional metamaterial, graphene not only has excellent electrical properties, thermal properties and optical properties, but also has the advantages of strong flexibility, high hardness, low density, corrosion resistance, and easy processing. Graphene has the best performance among the existing materials, so graphene has become one of the hotspots of in-depth research in the scientific and industrial circles. [0003] As a new type of wave-ab...
Claims
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IPC IPC(8): G16C60/00
CPCG16C60/00
Inventor 李猛猛周全恩陈如山李帅帅周仕浩胡燕萌
Owner NANJING UNIV OF SCI & TECH
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