All-optical diffraction and ultrafast switching in a terahertz-driven quantized graphene system

Over the past few years, we have witnessed a substantial evolution in graphene optoelectronics. The tunability of the electronic structure of graphene has led to the next generation of carbon-based nano-photonic devices. Motivated by the unique optical properties of graphene, in the present work, we show that the landau-quantized graphene can be regarded as a platform for implementing a 2D laser-induced grating with high diffraction ef-ficiency in the far-field regime. We consider a 2D doped graphene monolayer with a four-level system in ?-configuration driven by a terahertz field. The electromagnetically induced Fraunhofer diffraction patterns are simulated for a weak probe field passing through the graphene nano-sheet. The optimum conditions for the maximum diffraction efficiency are investigated. Then, it is shown that the probe beam propagation can be coherently controlled via applying a terahertz field. The possibility of ultrafast all-optical switching of the probe beam is investigated. The proposed system may find applications in integrated nano-photonic devices for optical communications, infrared spectroscopy, astronomy, optical sensing, and also the realization of all-optical switching processes.

Automated summary

In recent years, there has been significant progress in graphene optoelectronics. The tunable electronic structure of graphene has enabled the development of the next generation carbon-based nano-photonic devices. This study demonstrates the potential of landau-quantized graphene as a platform for a 2D laser-induced grating with high diffraction efficiency in the far-field regime. By considering a doped graphene monolayer and a terahertz field, the researchers simulated electromagnetically induced Fraunhofer diffraction patterns and investigated the conditions for maximum diffraction efficiency. They also explored the coherent control and ultrafast all-optical switching of the probe beam. This proposed system has potential applications in integrated nano-photonic devices for optical communications, infrared spectroscopy, astronomy, optical sensing, and all-optical switching processes.