Nonstandard Finite Difference Time Domain Algorithm for Berenger's Perfectly Matched Layer

摘要

The nonstandard (NS) finite difference time domain (FDTD) algorithm provides remarkably high accuracy on a coarse grid by optimizing to monochromatic wave propagation within each uniform region. But, an effective absorbing boundary condition (ABC) is also necessary to accurately calculate electromagnetic fields. Although Berenger's perfectly matched layer (PML) is a highly effective ABC, there is still no NS-formulation of it. In this paper, we develop a NS-version of the PML (NS-PML). We compare the NS-PML with other ABCs and demonstrate its excellent absorption.