Purely Coherent Nonlinear Optical Response in Solution Dispersions of Graphene Sheets
Purely Coherent Nonlinear Optical Response in Solution Dispersions of Graphene Sheets
复制标题
石墨烯片溶液分散体中的纯相干非线性光学响应
DOI：
10.1021/nl2023405
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发表时间：
2011-12-01
期刊：
影响因子：
10.8
通讯作者：
Wang, Enge
中科院分区：
文献类型：
--
作者：
Wu, Rui;Zhang, Yingli;Wang, Enge
我们已经开发了一种有效的化学剥离方法，用于高通量合成可溶液加工的高质量石墨烯片，该石墨烯片由烷基胺非共价官能化。利用近红外、可见光、紫外连续波和超快激光束研究了石墨烯片的非线性光学响应。在溶液分散体中明确观察到空间自相位调制。我们的研究结果表明，这种相干光散射是由于宽带，超快，非常巨大的三阶光学非线性chi（（3）），这是石墨烯的锥形大能量尺度带结构的表现。我们的实验结果赋予石墨烯在非线性光学应用的新潜力。
We have developed an efficient chemical exfoliation approach for the high-throughput synthesis of solution-processable, high-quality graphene sheets that are noncovalently functionalized by alkylamine. Purely coherent nonlinear optical response of these graphene sheets has been investigated, using near-infrared, visible, and ultraviolet continous wave and ultrafast laser beams. Spatial self-phase modulation has been unambiguously observed in the solution dispersions. Our results suggest that this coherent light scattering is due to a broadband, ultrafast, and remarkably huge third-order optical nonlinearity chi((3)), which is a manifestation of the graphene's cone-shaped large-energy-scale band structure. Our experimental findings endow graphene new potentials in nonlinear optical applications.