The hydrophobicity and optical properties of the HfO2-deposited glass

The HfO2 thin film was deposited on the glass substrate by physical vapor deposition and exhibited good surface flatness. The coating had smaller grain size with increasing RF power. A control of lower oxidation state of Hf (Hf2+) is a way to enhance the hydrophobicity of the HfO2-deposited glass. The nonlinear refractive index of HfO2 film on the glass substrate was measured by Moiré deflectometry, and was of the order of 10–8 cm2 W–1. As the RF power increased, the transparent HfO2-deposited glass showed a blue-shift and lower transmission in the near-IR region. On comparing with the pure glass, the HfO2-deposited glass exhibited hydrophobicity and had optical selection in the Vis–IR region for improving optical application.