Simple treatment of the enhancement of Raman scattering due to a two-dimensional array of metallic spheroids

A simple naive treatment of the enhancement of Raman scattering due to the presence of a two-dimensional array of metallic spheroids has been worked out as an extension of the existing particle-plasmon model. Calculated results, which are based on the $r^{\mathrm{-}3}$ term of dipolar fields, conform to the experiment. Comparisons and discussions show that this treatment, rather complete and accurate within the $r^{\mathrm{-}3}$ regime, provides the basic understanding of the physics of the spheroidal array experiment and also can serve to justify the existing single-spheroid approximations.