NONREFLECTING BOUNDARY-CONDITIONS FOR MAXWELLS EQUATIONS

Exact nonreflecting boundary conditions are derived for the time depen dent Maxwell equations in three space dimensions. These conditions hol d on a spherical surface B, outside of which the medium is assumed to be homogeneous, isotropic, and source-free. They are local in time and nonlocal on B, and they do not involve high-order derivatives. Thus, they are easy to incorporate into finite difference or finite element methods. These boundary conditions are similar to the exact nonreflect ing boundary conditions for the scalar wave equation which yield high numerical accuracy. (C) 1998 Academic Press.