Absorption Enhancement of S pherical Nano-S hells U sing Graphene Substrate

In this article the effect of using graphene substrate on absorption of spherical metallic gold Au and silver Ag nano shells has been investigated. In this study, for each one of two mentioned metallic nano shells, three kind of different dielectrics: air, silicon si and alumina Al_2 O_3, have been considered. Investigation, simulation and comparison of these nano shells have been done in two sizes of structure overall radius equal to 25 nm and 50 nm. According to performed studies on results, it is observed that utilizing graphene substrate under metallic nano shells increases amplitude of absorption. In this case, some parameters such as, thickness of metallic nano shells, thickness of graphene substrate, material of used dielectric, overall radius of structure and also material of surrounding medium are very effective on improving and increasing amplitude of absorption cross section ACS. So, to have maximum absorption, a trade of should be exist among mentioned parameters.