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In this paper, a simple finite difference time domain (FDTD) approach is presented for the analysis and design of graphene based optical devices. Here, Maxwell’s curl equations are expressed in normalized flux density. Then, the FDTD method is incorporated with that expression. As the flux density is considered, graphene conductivity which depends on frequency is easily incorporated with the method...
In this paper, multi-structural optical devices are designed based on graphene tri-layer sheets using finite deference time domain (FDTD) method with surface boundary condition (SBC). The perfectly matched layer (PML) absorbing boundary condition is also used with FDTD SBC to terminate the computational space. Numerical demonstration of plasmon polaritons (SPPs) wave propagating along variety shaped...
In this paper, a generalized approach of finite difference time domain (FDTD) modeling using surface boundary condition is presented for analyzing the properties of surface plasmon polaritons (SPPs) along straight and bent graphene parallel pairs. Incorporating intra-band conductivity into FDTD with perfectly matched layer absorbing boundary condition is used for SPP propagation modeling. Numerical...
This paper addresses a competent approach to obtain a computational model and a simulation fashion of graphene surface conductivity using sub-cell (SC) framework in the finite-difference time-domain (FDTD) method that incorporate to macroscopic and microscopic contributions. The FDTD update equations of graphene macroscopic and microscopic surface conductivity for dispersive sub-layer inside the Yee's...
This paper proposes a modified mathematical model of graphene interband conductivity. The proposed modified model is similar to Drude model that can be easily applied for wideband modelling up to optical frequency range. This model can easily be superimposed with various computational methods especially in the finite difference time domain method (FDTD) for wideband applications. The effect of biasing...
This paper deals with the electromagnetic (EM) wave propagation modeling in complex tunnel environments. We propose a novel segmented alternating direction implicit finite difference time domain (S-ADI-FDTD) method for modeling the electromagnetic wave propagation inside an electrically large tunnel. The proposed S-ADI-FDTD method reduces the computational redundancy by dividing the problem space...
We present unconditionally stable Non-orthogonal Locally One Dimensional (LOD) finite-difference time-domain (FDTD) method. The non-orthogonal formulation can be useful to extend the LOD-FDTD methods for curved discontinuities so as to obtain more accurate results with reduced computational resources. Formulations for CPML as well as scattered-field formulation are provided. Numerical simulations...
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