Abstract
A dielectric lens placed on a metal-dielectric interface can be used for in-plane focusing of surface plasmon (SP) modes. The propagation behind the lens is usually studied using scalar diffraction theory which is not accurate in nanometer regime and cannot explain the propagation and energy flow of SP modes. Here, we have used vectorial derivation of Huygens- Fresnel principal to calculate the diffracted fields behind the lens in order to study the energy flow of SP modes in a focusing system using the concept of higher order modes.
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