A Modified Perfectly Matched Layer Implementation for Use in Electromagnetic PIC Codes

A modification to the Berenger perfectly matched layer (PML) absorbing boundary condition that allows it to be used in particle-in-cell applications where the primary power flow through the boundary is due to electromagnetic radiation is presented. Instead of modeling particles within the PML, a term is introduced which diffuses charge conservation errors arising from the removal of particles incident on the PML to the outer boundary. Numerical results are provided to demonstrate the performance of the algorithm.