Electromagnetic scattering of high-permittivity particles on a substrate

We contribute to the study of the optical properties of high-permittivity n anostructures deposited on surfaces. We present what we believe is anew com putational technique derived from the coupled-dipole approximation (CDA), w hich can accommodate high-permittivity scatterers. The discretized CDA equa tions are reformulated by use of the sampling theory to overcome different sources of inaccuracy that arise for high-permittivity scatterers. We first give the nonretarded filtered surface Green's tensor used in the new schem e. We then assess the accuracy of the technique by comparing it with the st andard CDA approach and show that it can accurately handle scatterers with a large permittivity, (C) 2001 Optical Society of America.