研究目的
to develop an accurate and stability-improved ADE-FDTD method to simulate graphene-based structures with both intraband and interband conductivities.
研究成果
The proposed stability-improved ADE-FDTD method has been developed for broadband simulation of graphene-based structures. With the graphene sheet considering as an electric polarization term instead of a current source characterized by an auxiliary equation, the proposed method has the same CFL condition as conventional FDTD method. Numerical results have shown that the proposed method can efficiently investigate the properties of some graphene-based structures very accurately in a broad range of frequencies.
研究不足
The study focuses on the stability-improved ADE-FDTD method for broadband modeling of graphene structures, but does not explore the method's applicability to other materials or structures beyond graphene.
1：Experimental Design and Method Selection:
The study introduces an electric polarization term characterized with an auxiliary equation to incorporate the graphene sheet into the FDTD method without decreasing the CFL number.
2：Sample Selection and Data Sources:
The computational domain includes 20×20×120 cells, terminated by 10-layer CPMLs at its both ends. A TF/SF boundary condition is used to introduce a normal incident plane wave, and PBC boundary condition is used to simulate an infinitely wide graphene sheet.
3：List of Experimental Equipment and Materials:
The study uses a Gaussian incident pulse and sets parameters such as fmax=300 THz, ?x=?y=?z=?=c0/(20fmax) m, ?t=?/(31/2c0) with c0 being the speed of light in vacuum.
4：Experimental Procedures and Operational Workflow:
The update computations from time step n to n+1 are as: first calculating Hn+1/2 by the conventional FDTD method, then En+1 by (19), finally Pn+1 by (18).
5：8). Data Analysis Methods:
5. Data Analysis Methods: The stability condition is analyzed and numerical experiments are carried out to validate the proposed method with analytical results.
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