A model taking into consideration the refractive index inhomogeneity and surface roughness of a film was proposed for the simultaneous determination of the optical constants, thickness, and surface roughness of a single-layer thin film from spectrophotometric measurements. In the model, the rough surface was treated as an effective absorbing layer. The model was applied to determine simultaneously the parameters of single-layer MgF2 thin films deposited on fused silica substrates by the oblique-angle deposition technique. The film thicknesses and rms surface roughnesses extracted from spectrophotometric measurements with the proposed model were in good agreement with the values measured by a spectroscopic ellipsometer and an atomic force microscope, respectively. (C) 2012 Optical Society of America
1.Chinese Acad Sci, Inst Opt & Elect, Chengdu 610209, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China
Guo, Chun,Kong, Mingdong,Gao, Weidong,et al. Simultaneous determination of optical constants, thickness, and surface roughness of thin film from spectrophotometric measurements[J]. OPTICS LETTERS,2013,38(1):40-42.