Electromagnetic theory of SERS effect of molecules encapsulated in spherical metal shell

The analytical theory as well as experimental observation of the plasmons excited in the spherical metal resonator stuffed by investigated molecules is presented. A simple lumped model of the plasmons generated in the metal nanosphere is developed. The electromagnetic mechanism of the surface-enhanced Raman Scattering (SERS) can be investigated qualitatively and quantitatively. The theoretical results are in a qualitative agreement with our experiment on SERS in silver coated polystyrene spheres.