Study on Enhancement of Single Molecule Fluorescencesing Metallic Nanoparticles

Electromagnetic field of gold and silver nanoparticles under plane wave and electric dipole incident are investigated. By using Maxwell’s equation and multi-multipole method, a set of linear equations of expansion coefficients is first constructed by satisfying boundary condition pointwisely. Singular value decomposition is then used to solve the overdetermined liner equations. tudy on coupling of single fluorescent molecule and metallic (solid and core-shell) nanoparticles . Under plane wave incident, the local electric field would be arose and let the molecule reaching excitation stage and liberating fluorescence. We use a electric dipole to simulate single fluorescence molecule. By working with metallic nanoparticles, the molecule would have fluorescence enhancement of single molecule. Then we use the strong electric local field from two metallic nanoparticles to excite the molecule. We demonstrate that it would generate the better enhancement. And the maximum enhancement is achieved when the emission frequency is red-shift from the surface plasmon resonance of the particles.