▎ 摘　　要

Graphene flakes have a layered structure with optical properties dependent on the layer number. We measured and calculated reflectivity of single-layer to multi-layer graphene flakes on SiO2/Si substrate up to nearly one hundred layers in the broad wavelength range of 450-750 nm. It was noticed that there is an optimized optical matching between single-layer to five-layer graphene flakes and the SiO2 layer due to the interference effect. It is feasible for the single-layer to five-layer graphene flakes to exploit the enhancement of anti-reflection coating with the help of the SiO2 layer. The optimal anti-reflection wavelength is selectable by adjusting the thickness of the SiO2 layer. It is helpful in the development of highly functionalized optical film with the nanoscale thickness. (c) 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement