Holographic patterning of graphene-oxide films by light-driven reduction
  We report on the patterning and reduction of graphene-oxide films by holographic lithography. Light reduction can be used to engineer low-cost graphene-based devices by performing a local conversion of insulating oxide into the conductive graphene. In this work, computer generated holograms have been exploited to realize complex graphene patterns in a single shot, differently from serial laser writing or mask-based photolithographic processes. The technique has been further improved by achieving speckle noise reduction: submicron and diffraction-limited features have been obtained. In addition we have also demonstrated that the gray-scale lithography capability can be used to obtain different reduction levels in a single exposure. 
Emanuele Orabona, Antonio Ambrosio, Angela Longo, Gianfranco   Carotenuto, Luigi Nicolais and Pasquale Maddalena
cond-mat.mtrl-sci physics.optics