An isotropic PML for the FDTD solver

An isotropic perfectly matched layer is proposed in this paper, which is used in truncating boundary around computational region. Making use of refraction enhancement scheme in optics, we get a matching medium layer named as anti-reflection. It is capable of propagating the wave through the imaginary medium completely. Numerical experiment has been proved that the method is efficient by applying to the finite-difference time-domain solver.