A new algorithm to achieve rapid field convergence in the frequency domain when using FDTD

When an electromagnetic pulse is used as the initial excitation in the finite difference time domain (FDTD) calculation for light scattering by a dielectric particle, the convergence of the signals in the frequency domain depends mainly on the damping rate of the time-dependent electromagnetic fields within the computational domain. If the refractive index of the scattering particle is small, the corresponding electromagnetic field in the FDTD computation decreases quite slowly and it takes a substantially long duration to obtain a converged result. In this paper we illustrate this feature of the electromagnetic field in the FDTD simulation and will produce an algorithm to overcome the associated slow-convergence.

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