Study Of Al_2o_3/tio_2 Reflectivity Enhancing Bi-layer Films On Bright Aluminium Substrates

摘要

Al_2O_3/TiO_2 bi-layer films on aluminium substrates have been obtained by combining anodising and TiO_2 sol-gel deposition. The reflectivity enhancing properties of these Al_2O_3/TiO_2 bi-layer films have been studied in relation to the refractive index and thickness of the Al_2O_3 and TiO_2 single-layers. It is shown that a significant improvement of reflectivity can be achieved by a proper optimisation of the bi-layer elaboration parameters.