Estimation of refractive index for thin film aluminum nitride on quartz substrates using envelope method
Abstract
Aluminum Nitride (AlN) films were deposited using Reactive RF Magnetron Sputtering with thicknesses of 0.86 µm and 1.26µm on quartz substrates. The AlN films were deposited using total gas pressure of 8x10-3mbar, with 1:3 Ar-N2 partial pressure ratio. The films were highly transparent in the visible region (380-750nm) and exhibited strong absorption in the UV range (200-300nm). From the optical transmission profiles, the refractive indexes of the thin films were computed. For the 0.86µm the estimated refractive index ranges from 1.5-1.64 and 1.26µm AlN ranges from 1.4-1.64.