A novel scheme for simple and precise measurement of the complex refractive index and thickness of thin films

We demonstrate applications of a novel scheme which is used for measuring refractive index and thickness of thin film by analyzing the relative phase difference and reflected ratio at reflection point of a monolithic folded Fabry-Perot cavity (MFC). The complex refractive index and the thickness are calculated according to the Fresnel formula. Results show that the proposed method has a big improvement in accuracy with simple and clear operating process compared with the conventional Ellipsometry.