Abstract: This paper presents a new scheme, which is used in discretizing Berengers split field representation of Maxwell’s equations, in order to use the perfectly matched layer(PML) with the alternating direction implicit(ADI) finite-difference time-domain(FDTD) method instead of the standard FDTD method. Compared with the discretization scheme proposed earlier, the new one makes the reflection errors of PML absorbing boundary condition decrease by orders of magnitude when a larger time step is used.

Key words: finite-difference time-domain(FDTD) method, alternating direction implicit(ADI) algorithm, perfectly matched layer(PML)