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This paper presents the numerical dispersion analysis of the efficient two-dimensional Laguerre-based finite-difference time-domain (FDTD) method. The numerical dispersion relation is derived and the numerical dispersion errors are investigated. The results indicate that, by choosing the suitable values of the sampling point density in space domain and the time-scale factor, one can ensure the numerical...
This paper describes a modification of the unconditionally stable finite difference time domain (FDTD) algorithm based on the Associated Hermite (AH) functions. The original method is involved with solving a banded nested matrix equation to calculate the AH expanding coefficients using lower-upper (LU) decomposition, which is the main cost for CPU time and memory storage. Here, the calculation of...
We numerically demonstrate the shape (“c”, triangle and diamond) and orientation of surface plasmon vortex intensity distribution can be arbitrarily tailored within a plasmonic spiral through simple geometrical design.
We numerically demonstrate a designed plasmonic nanocluster can function as nanoscopic polarization analyzer to a quantum emitter. Up to ten polarization states of such source can be distinguished.
In this letter, an unconditionally stable finite-difference time-domain(FDTD) scheme based on weighted Laguerre polynomials(WLP) for solving cylindrical structures is proposed. The validity of the proposed formulations is shown through a numerical example of radiating in cylindrical coordinates.
In many electrical and electronic systems, metallic enclosures are used to provide electromagnetic shielding. These enclosures normally contain thin wires, thin slots, and frequency-selective slots that degrade the shielding effects. The capacitance thin-slot formalism (C-TSF) by [2] has been around for quite some time in the finite-difference time-domain analysis (FDTD) of thin-slot penetration....
This paper presents a new method with parallel FDTD algorithm based on MPI library to analyze thin-slot coupling, which often leads to huge computation. It is demonstrated that the adopted parallel strategy is feasible by comparing the results of serial FDTD computation with that of the proposed method. The high efficiency of this method is also proved. Comparison of the field components given by...
In designing some UWB-IR (ultra-wideband impulse radio) devices, the effects of ground echoes must be taken into consideration. The dispersion of soil and roughness of ground surface are significant factors in ground echoes calculation. FDTD (finite difference of time domain) algorithms applied in ground echo simulation at present have the problems of slow speed or large errors. By using multi-pole...
To simulate the EMP propagation in large-scale and long-distances vaulted tunnel, an effective MW-FDTD method based on parallel computing was presented. The convolution PML (CPML) is adopted to truncate the computation domain, which reduces the reflection error greatly. The accuracy and the efficiency of the proposed method have been verified by comparing the results of the parallel FDTD algorithm...
In this paper, a perfectly matched layer (PML) implementation for an unconditionally stable finite-difference time-domain scheme based on weighted Laguerre polynomials(WLP-FDTD) in cylindrical coordinates is presented. A numerical example is introduced to validate the proposed formulations.
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