Graphene-based ultrathin optical components printed by femtosecond laser direct writing method

We demonstrated various diffractive optical components based on a sub-micrometer graphene oxide (GO) film using a femtosecond (fs) laser direct writing method. The designated GO region exposed to the fs pulses is converted to reduced GO (rGO) with high optical absorbance via photoreduction. The GO/rGO pattern acts as a binary diffractive element.