PEMC-backed perfectly matched layer as a truncation boundary

A new application for perfect electromagnetic conducting boundary, a recently introduced type of perfectly conducting boundaries creating nonreciprocal reflection is proposed. In this application, PEMC boundary is used for truncating perfectly matched layers which have been so far truncated by perfect electric/magnetic conductor in the numerical techniques based on finite methods. Due to nonreciprocal reflection from the PEMC boundary, the reflected wave can be cross-polarized with respect to the incident wave. As a result, in a 2D numerical computation, a TE/TM incident field on the truncating boundary (PEMC-backed PML) generates TM/TE reflected field, different from desired field polarization (TE/TM). Therefore the cross-polarized reflected field can be ignored in the evaluation of the desired fields.