Investigation of excitation of plasmonic nano-particles by emitting molecules

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Excitation of plasmonic nano-particles by emitting dipoles is encountered in various applications such as Surface Enhanced Fluorescence/Raman scattering. To develop essentially new principles for the design of novel sensor concepts based on dipole excitation light scattering tools are needed for simulation. For various reasons the application of common and standard light scattering simulation methods such as Discrete Dipole Approximation (DDA) or Finite Difference Time Domain (FDTD) would be problematic and computationally very expensive especially if the nano-particles are positioned on a plane surface. Within this project we like to develop the Discrete Sources Method to the case of nano-particle excitation by an electric dipole of any orientation deposited in the vicinity of a nano-particle in the presence of a multilayered structure such that we can simulate the inaction between surface plasmon resonance, plasmonic particles and an excited molecule represented by a dipole. The method will be developed, validated and finally used to investigate the influence of the geometrical parameters on the average enhancement factor for a molecule near a plasmonic particle.