Research On Effect Of Surface Plasmon To Spontaneous Emission Of Dipole

The reserch on spontaneous emission of single molecule or single atom plays an important role in the development of quantum optics and biological dynamics. The key idea of modifying the spontaneous emission of atom or molecular is to modify the local density of photon states of the position where the emitter places. One of the most promising ways of achieving this is the special optical properties of surface plasmon polaritons.The localized surface plasmon resonances depend on many factors,such as size, shape and material of the metallic nanostructures and the environment where the emiters and metallic nanostructures place. A numerical approach based on the Finite Element Method (FEM) has been applied to investigate the modifications of the dipole decay rates, quantum efficiency, Purcell Factor and fluorescence enhancement for varying geometrical parameters of the system combined by the dipole and nanoantenna.The main contributions of this paper can be summarized as follows:1. Put forward 3 kinds of ways to calculate the normalized decay rate of the radiating dipole based on the classical theory of dipole radiation, theory of dyadic Green function and quantum theory of spontaneous radiation, and verify the validity of them;2. Present the general method to model the system combined by the dipole and metal nanostructure based on FEM, explain the physical quantities that should be calculated in detail and provide the approach to calculate them;3. Make the modeling and simulation of systems combined by the dipole and spherical nanoantena, cone nanoantena, and metallic nanodimer respectively by the software of Comsol Multiphysics based on FEM, and gives an analysis for the results.