Spectroscopic analysis of dipole interaction of metallic nanoparticles in dielectric multilayer dielectric thin film

Using electron beam gun PVD system, the thin film with multiple alternative layers of SiO2 + Ag (300 nm)/SiO2 (10-60 nm) was deposited on silica substrate. Annealing test was undertaken for optical absorption analysis. The annealing agglomerated metallic nanoparticles in each layer has enhancement effect for plasmon resonance absorption, these precipitated nanoparticles also cause absorption peak red shift. When the thickness of alternative dielectric layer becomes small enough, there is a coupling phenomenon between the electric dipoles of nanaoparticles in the alternative metallic particle doped layers.