论文标题
在石墨烯 - 硅旋烯波导中使用光子对生成石墨烯光学非线性的评估
Evaluation of graphene optical nonlinearity with photon-pair generation in graphene-on-silicon waveguides
论文作者
论文摘要
我们通过通过自发的四波混合产生的光子对的巧合测量来评估石墨烯波导的非线性系数。我们观察到来自波导的光子对的时间相关性在石墨烯片的各种传输布局上。对实验结果的简单分析使用耦合波方程表明，原子薄的石墨烯片增强了硅波导的非线性最高十倍。结果表明，基于纯$χ^{（3）} $ - 基于有效的非线性非线性折射率的订单为$ 10^{ - 13} $ M $^2 $/W，并为基于石墨烯的非线性光学的应用提供了重要的见解。
We evaluate the nonlinear coefficient of graphene-on-silicon waveguides through the coincidence measurement of photon-pairs generated via spontaneous four-wave mixing. We observed the temporal correlation of the photon-pairs from the waveguides over various transfer layouts of graphene sheets. A simple analysis of the experimental results using coupled-wave equations revealed that the atomically-thin graphene sheets enhanced the nonlinearity of silicon waveguides up to ten-fold. The results indicate that the purely $χ^{(3)}$-based effective nonlinear refractive index of graphene is on the order of $10^{-13}$ m$^2$/W, and provide important insights for applications of graphene-based nonlinear optics in on-chip nanophotonics.
