Abstract
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.
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