On fibre tip graphene-based ultrathin flat lens towards high-resolution endoscopes

The research presented in tWe have developed a new and exact design method for high numerical aperture graphene-based lens, and it also can be used for the lens design with other two dimensional materials. Experiments have demonstrated the extraordinary environmental stability of the rGO lens, this helps the practical applications of the rGO lens, such as endoscope. As the most important part of an endoscope, our on fibre tip graphene oxide (GO) lens has proved its high resolution capability experimentally. With the low cost and high resolution, our endoscope with graphene-based lens will show significant value in medical instrument field.