Creating a broadband diffractive graphene orbital angular momentum metalens by laser nanoprinting

Optical beams carrying orbital angular momentum (OAM) attract widespread attention and play an important role in optical data storage, optical communications, quantum information processing, super-resolution imaging, and optical trapping and manipulation. However, the bulky volume and the complex systems of the conventional OAM beam generators limit their applications in integrated and miniaturized optical or photonic devices.