The Optics and Applications of Graphene Based Colours

The main purpose of this paper is to study the properties and physical mechanism of the structure film color based on graphene oxide and reduced graphene oxide, including the design and realization of colorful pattern and the exploration of their applications. The main achievements can be summarized as follows: Existing strategies of structural colouration are extremely challenging to achieve full coloured pixels with diffraction-limited resolution without sophisticated multiple-step nanostructure fabrication or externally applied field control. Realization of dynamically switchable full colour displays with diffraction-limited resolution is even harder. This work demonstrates a structural colour strategy with a developed anisotropic graphene metapixels. The anisotropic optical property is given by the intrinsic birefringence of the layered structure of graphene metamaterials, and each metapixel is spatially encoded by direct laser writing with diffraction-limited resolution (250 nm). The colours can be dynamically and instantly switched by controlling the scattering of the light source to excite different modes based on the strong anisotropic optical properties of the graphene metapixels. The low-cost large-scale fabrication method allows experimental demonstration of a large-area (4 inches) flexible full colour optical switchable display. Such a simple, effective and flexible method promises broad practical applications in colour display and colour image sensing related fields.