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Optical characterisation of hybrid antireflective coatings using spectrophotometric and ellipsometric measurements

A hybrid antireflective coating combining homogeneous layers and linear gradient refractive index layers has been deposited using different techniques. The samples were analysed by optical characterisation based on spectrophotometric and spectroscopic ellipsometric measurements under different angles of incidence in order to precisely characterise the coatings. The Lorentz-Lorenz model has been used for calculation of refractive index of material mixtures in gradient index layers as well as some homogenous parts of the coating. The obtained refractive index profiles have been compared with the targeted ones to detect errors in processes of deposition.

antireflective coating ; optical characterisation ; hybrid coating ; reverse engineering ; variable angle spectroscopic ellipsometry

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