Graphics processor unit accelerated finite-difference time domain method for electromagnetic scattering from one-dimensional large scale rough soil surface at low grazing incidence

Abstract

The graphics processor unit-based finite-difference time domain (FDTD) algorithm is applied to study the electromagnetic (EM) scattering from one-dimensional (1-D) large scale rough soil surface at a low grazing incident angle. The FDTD lattices are truncated by a uniaxial perfectly matched layer, and finite difference equations are employed in the whole computation domain for convenient parallelization. Using Compute Unified Device Architecture technology, we achieve significant speedup factors. Also, shared memory and asynchronous transfer are used to further improve the speedup factors. Our method is validated by comparing the numerical results with those obtained by using a CPU. The influences of the incident angle, correlation length l, and root-mean-square height δ on the bistatic scattering coefficient of a 1-D large scale rough surface at low grazing incidence are also discussed.

Depolarization of surface scattering in polarized laser scattering detection for machined silicon wafers

“…Two methods, i.e., numerical and analytical, are available to resolve the EM scattering of a rough J o u r n a l P r e -p r o o f surface. The numerical method, e.g., the method of moments (MOM) [22], finite element method (FEM) [223], and finite difference time domain (FDTD) [24], can precisely resolve the surface EM scattering of a part in a complex geometrical shape. However, such a method requires a large amount of computation for an accurate result, which limits its practical application.…”

A Novel Hybrid Algorithm for Transient Near-Field Scattering from Rough Surface in 2-D Case

“…In the past decade, the numerical method has been widely used in the EM analysis owning to the rapid development of the high performance computer [8][9][10][11]. Among them, the finite-difference time-domain (FDTD) method is a powerful and popular technique for numerically solving the transient field problem, and it has achieved successful applications in the far-field scattering from rough surface [12][13][14]. However, when the FDTD is used to simulate the near-field scattering, a brute-force way is to enlarge the computational domain to enclose the rough surface and observation point, which will lead a heavy burden to the computation resource available.…”