The nite-diierence time-domain (FDTD) method is a numerical technique that makes no explicit physical approximations to the underlying problem. The quality of an FDTD-based solution typically is determined by the discretization of the computational domain|the smaller the spacing, the more accurate the solution. Unfortunately, for large computational domains, i.e., ones spanning many wavelengths...

We have examined the Maxwell-Garnett, inverted Maxwell-Garnett, and Bruggeman rules for evaluation of the mean permittivity involving partially empty cells at particle surface in conjunction with the finite-difference time-domain (FDTD) computation. Sensitivity studies show that the inverted Maxwell-Garnett rule is the most effective in reducing the staircasing effect. The discontinuity of perm...

This paper presents an efficient and simple approach of implementing the Landau-Lifshitz-Gilbert (LLG) equation of magnetisation motion within the Finite-difference Time-domain (FDTD) method. This combined electromagnetic-micromagnetic simulation technique is particularly important for modeling electromagnetic interaction with lossy magnetic material in the presence of current and magnetic sour...

In this article we present νFDTD (New FDTD), an efficient and accurate method for solving low frequency problems and with those non-conformal geometries by using the Finite Difference Time Domain (FDTD) method. The conventional time domain technique FDTD demands extensive computational resources when solving low frequency problems, or when dealing with dispersive media. The νFDTD technique is a...

Understanding and predicting electromagnetic behavior is needed more and more in modern technology. The Finite-Difference Time-Domain (FDTD) method is a powerful computational electromagnetic technique for modelling electromagnetic space. However, the computation of this method is complex and time consuming. Implementing this algorithm in hardware will greatly increase its computational speed a...

in this paper, we proposed a novel structure for designing all optical filter based on photonic crystal structure. in designing the proposed filter, we simply employed a point defect localized between input and output waveguides as wavelength selecting part of the filter. the initial form of this filter is capable of selecting optical waves at =1560 nm, the transmission efficiency of the filte...

The hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) method is a weakly conditionally stable (FDTD) method. time step size of the HIE-FDTD only confined by two coarse spatial cell sizes, so it widely used in simulation electromagnetic targets with fine structures along one direction. In this work, basic iterative formulations are proposed approximating FDTD these formulations, ...

In this contribution we first briefly introduce a new Reduced Order Modelling (ROM) algorithm based on the decomposition of the system transfer matrix into orthogonal scaled Laguerre functions. This new technique overcomes the difficulty of unstabilities at low frequencies often experienced with other ROM techniques. Next, we propose a new approach to automatically derive subcell models for 2D ...

FDTD has become a popular tool in acoustic modelling in recent years. A main attraction of FDTD is that it can be implemented in computer code easily using simple straightforward marching algorithms and finite difference equations. However, this simplicity comes at a price. Dispersion errors, source scattering, and frequency dependent boundary reflections are just a few of the problems that FDT...

Edelvik, F. 2002. Hybrid Solvers for the Maxwell Equations in Time-Domain. Acta Univ. Ups. Uppsala Dissertations from the Faculty of Science and Technology 40. 164 pp. Uppsala. ISBN 91-554-5354-6. The most commonly used method for the time-domain Maxwell equations is the FiniteDifference Time-Domain method (FDTD). This is an explicit, second-order accurate method, which is used on a staggered C...