Microstructure and multiphoton luminescence of Au nanocrystals prepared by using glancing deposition method

Au crystal columns embedded in SiO2 with an average length of 480 nm and diameter of 30 nm were prepared by radio frequency co-sputtering technique with glancing angle. The photoluminescence (PL) of the Au–SiO2 crystal column film exhibited polarization characteristic. With an increase of the laser power, the slope ∂ log(PL intensity)/∂ log(laser power) changed from 2 to 3, which indicated that the PL of Au–SiO2 crystal columns were induced by two- and three-photon absorption, respectively.