Rahil Rezwan, Bernardo Dias, Tom Hoekstra, Mehmet Atıf Durmuş, Bauke van der Vorm, Till Weickhardt, Omid Ghaebi, Zhuoyuan Lu, Devapriyo Mithun, Carsten Ronning, Yuerui Lu, Jorik van de Groep, Giancarlo Soavi
Control over light focusing is paramount for optical and imaging systems. However, its implementation in active and integrated nanophotonic devices is hindered by the bulky and static nature of standard lenses. Here, we show that Fresnel Zone Plate Lenses (FZPL) based on a monolayer Transitional Metal Dichalcogenide are a viable solution to the challenges of miniaturization, integration, and active control of the focusing efficiency, featuring both ultrafast and large modulation depth. Using a monolayer $WSe_2$ FZPL, we demonstrate all-optical ultrafast ($\sim$ ps) modulation of the focusing efficiency close to $\sim$30\%, that we achieve by exploiting the nonlinear exciton-resonant enhancement and modulation of second harmonic generation.