非线性原子级薄透镜聚焦效率的超快调谐
Ultrafast tuning of the focusing efficiency of a nonlinear atomically thin lens
浏览论文内容
中文总结 AI 辅助
该研究提出基于单层过渡金属二硫化物的菲涅耳波带片透镜（FZPL），实现了近30%的全光超快聚焦效率调制，解决了光聚焦器件小型化与有源控制的难题。
中文摘要 AI 辅助
光聚焦的控制对光学和成像系统至关重要。然而，标准透镜体积庞大且静态，阻碍了其在有源集成纳米光子器件中的应用。本文展示了基于单层过渡金属二硫化物的菲涅耳波带片透镜（FZPL）可解决聚焦效率小型化、集成化及有源控制的挑战，兼具超快响应与大调制深度。利用单层WSe₂ FZPL，我们通过非线性激子共振增强及二次谐波产生的调制，实现了近~30%的全光超快（~皮秒）聚焦效率调制。
英文摘要
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.
