Accurate modeling of dispersive material interfaces in high-order finite-difference methods

When solving Maxwell´s equations using high-order finite-difference methods in the presence of dispersion, it is particularly important to have an appropriate procedure to model material interfaces that can handle nonuniform grids. This paper shows that, if such procedure is in place, then is possible to achieve high-order convergence using coarse discretizations even in the extreme case of analyzing a Lorentz material interfaced with vacuum and excited at its plasma frequency.