Layered medium discrete dipole approximation

In this work, we improved discrete dipole approximation (DDA) to layered medium by formulating the problem with layered medium Green´s functions (LMGFs). In order to calculate thousands of LMGF samples, we subtract the singularities of LMGFs and add their contributions analytically. This new layer medium DDA can solve electromagnetic scattering from arbitrarily shaped objects embedded in a layered medium accurately. Numerical results clearly demonstrate the efficiency of the method with respect to regular DDA and frequency domain full wave solvers.