Plasmon coupled nanoparticle arrays for fluorescence, photoluminescence and Raman scattering enhancement

We study the enhancement of the fluorescence an photoluminescence by large homogeneous arrays of plasmon coupled 5-8 nm Au and Ag nanoparticle separated by distances less than 10 nm. A red shift of the major “symmetric” plasmon mode near 780 nm, and additional “anti-symmetric” plasmon mode centered near 310 nm evidence the plasmon coupling in Au particle arrays. The systems were found to be effective in enhancement of the fluorescence/photoluminescence processes.