A particle analog simulation method for graphene surface plasmon

Abstract

The invention discloses a particle analog simulation method for graphene surface plasmon, and relates to the technical field of computer analog simulation. The method comprises the following steps ofstep 1 multiplying a conductivity formula provided by a two-dimensional graphene model by an electric field of a grid where graphene is located to obtain a solution formula of current density on the grid;2 adopting a time domain finite difference method to carry out difference on a solution formula of the surface current density; 3 setting simulation initial conditions, and adopting a time domainfinite difference method for calculation; and step 4 substituting the surface current density of the (n + 1)-th step on the grid surface where the graphene is located and the electric field of the (n+ 1)-th step obtained in the step 3 into the difference formula obtained in the step 2 to obtain the surface current density of the (n + 3)-th step on the grid surface where the graphene is located; and 5 circularly executing the step 3 and the step 4 in sequence, and finally realizing particle analog simulation of the graphene surface plasmon. The method provided by the invention has an instructive effect on the research of preparing novel terahertz radiation sources and infrared radiation sources by adopting graphene.

Description

technical field [0001] The invention relates to the technical field of computer simulation. Background technique [0002] Graphene has become the most attractive research field in modern science and technology due to its special properties and huge potential applications. Since the plasma oscillation frequency in graphene is between 1-50THz, it belongs to the range of terahertz frequency band and infrared frequency band. Therefore, many functions of graphene-based plasmons play an important role in the research and development of photonic and optoelectronic applications, such as ultrafast lasers, solar electromagnetics, optical regulators, photodetectors, and light emitting devices. Both theory and experiments have proved that graphene can excite surface plasmons when the real part of the permittivity is negative. [0003] The basic properties and excitation methods of surface plasmons in graphene are similar to noble metal thin films. For example, graphene surface plasmo...

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Problems solved by technology

[0012] The technical problem to be solved by the present invention is to simulate the surface plasmon particles of graphene caused by the characteristics of the existing technology, such as the thickness of graphene is too small, and the period of surface plasmons is too large compared to the time step. For difficult simulation problems, a particle simulation method for graphene surface plasmons is provided, which can use larger grids and larger time steps, while reducing memory consumption and calculation load, while ensuring the accuracy of the simulation accuracy

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