ABSTRACT
Continued fraction absorbing boundary conditions (CFABC) are artificial boundary conditions that can be used for modeling wave absorption into an unbounded exterior. In this paper, CFABC are extended to modeling wave propagation in dispersive media. While the original CFABC are effective only for propagating waves, the proposed extension is effective also for evanescent waves that could be predominant in dispersive media. The main idea is to augment the original CFABC with a special padding region that would act as an effective boundary condition for evanescent waves. Presented here is the basic idea behind the extension, summary of various issues that were resolved during the development, and a numerical example illustrating the effectiveness of the proposed approach.