The parameters describing spatial dimensions are expressed in arbitrary units. The running area of the simulation is determined by the

and

parameters. The number of mesh points per unit on the

and

axes is set by the parameters

and

, respectively. The time step of the simulation is set for a Courant factor

. The total field area is defined by the

,

,

and

parameters. For simplicity, the permittivity and permeability of free space are set to 1. Hence, the velocity of the plane wave equals unity (

), and the wavelength and period of the source are numerically equal (

). The injection (propagation) angle is defined as the angle between the

axis and the wave vector of the source

, and is given by

, where the parameters

and

are multiples of

and

, respectively.