Influence of substrate on the optical properties of non-aggregated silver nanoparticles

In this paper, experimental results on the influence of the substrates of different refractive index on the optical properties of two-dimensional silver nanoparticle array are presented. It is shown that plasmon mode that arises from cooperative interactions between closely spaced nanoparticles exhibit different dependences on the incident angle of light. Those dependencies can be qualitatively explained by the concept of mirror images induced in a substrate. Semiconductor (ITO) substrate possesses higher refractive index which even more affects the optical response of silver nanoparticle array

Plasmon-exciton coupling in nanostructured metal-semiconductor composite films

Nonlinear optical response of metal-semiconductor Zn0.8Co0.2O/Au nanocomposite films was studied experimentally and theoretically. Z-scan measurements revealed a positive nonlinear index of refraction of the composite film. Fluorescent spectroscopy measurements exhibited a narrow sharp peak that might be attributed to exciton peak of semiconductor nanostructured thin film enhanced by nearby gold nanoparticles. Classical electrodynamic calculations of a quantum dot in close proximity to a gold nanoparticle agree well with the experimentally observed normalized quantum efficiency