“…For problems of multiple particle scattering, analytic solutions are rare, except for very simple shapes: two parallel infinite planes (corresponding to the FabryPerot interferometer) is another textbook example, as are coaxial cylinders [13], concentric spheres [14], two parallel cylinders [15,16], and two spheres [17]. However, even the apparently simple problem of a plane wave scattered by a sphere or cylinder situated near a planar substrate has not yet been completely solved to give rigorous analytic solutions, and thus various approximation methods have been proposed [18][19][20][21][22][23][24][25].…”