A GENERAL-APPROACH TO EXTEND BERENGERS ABSORBING BOUNDARY-CONDITION TO ANISOTROPIC AND DISPERSIVE MEDIA

Recent studies have focused on the extension of the Berenger's absorbi ng boundary condition (ABC)-the perfectly matched layer (PML)-to aniso tropic and dispersive media. In this letter, we describe how the PML c an be extended for anisotropic and/or dispersive media (or even bianis otropic media) with little analytical effort, in a simple and general conceptual setting, by using an analytical continuation of the coordin ate space of the Maxwell's equations to a complex variables domain. Us ing this approach, there is no conceptual distinction between the deri vation of PML for more complex media and the derivation for isotropic, dispersionless media.