Theory of enhanced Raman scattering for circular stratified semiconductor cylinder

Based on the electrodynamic theory, we have calculated the scattering fields of infinitely long dielectric nanocylinders with silver coating, and compared them with those of a pure silicon cylinder. The calculation result indicates that there exists an enhanced electric field in the silver-coated silicon nanocylinder and shows a great Raman enhancement factor (∼1012) as compared with bulk silicon. For a special area in the silver-coated silicon nanocylinder, the enhancement comes up to 4 x 1013