A PERFECTLY MATCHED ANISOTROPIC ABSORBER FOR USE AS AN ABSORBING BOUNDARY-CONDITION

An alternative formulation of the ''perfectly matched layer'' mesh tru ncation scheme is introduced. The present scheme is based on using a l ayer of diagonally anisotropic material to absorb outgoing waves from the computation domain. The material properties can be chosen such tha t the interface between the absorbing material and free space is refle ction-less for all frequencies, polarizations, and angles of incidence . This approach does not involve a modification of Maxwell's equations and is easy to implement in codes that allow the use of anisotropic m aterial properties.