Thin oxidized copper films in various thickness values are deposited onto quartz glass substrates by electron beam evaporation. The ellipsometry parameters and transmittance in a wavelength range of 300 nm-1000 nm are collected by a spectroscopic ellipsometer and a spectrophotometer respectively. The effective thickness and optical constants, i.e., refractive index n and extinction coefficient k, are accurately determined by using newly developed ellipsometry combined with transmittance iteration method. It is found that the effective thickness determined by this method is close to the physical thickness and has obvious difference from the mass thickness for very thin film due to variable density of film. Furthermore, the thickness dependence of optical constants of thin oxidized Cu films is analyzed.


This work presents an anti-windup design method for improving the performance of single input adaptive control systems in strict feedback form with input saturation. By an appropriate modification of the adaptation laws without saturation, excessive adaptation is prevented during an input saturation. A stability analysis and a proof of asymptotic convergence of the output tracking error are provided. The performance of the proposed design is demonstrated through simulations.