石墨烯
迪拉克费米子
费米子
非线性系统
物理
订单(交换)
Dirac(视频压缩格式)
无质量粒子
凝聚态物理
量子电动力学
量子力学
财务
经济
中微子
作者
Tao Jiang,Di Huang,Jinluo Cheng,Xiaodong Fan,Zhihong Zhang,Yuwei Shan,Yangfan Yi,Yunyun Dai,Lei Shi,Kaihui Liu,Changgan Zeng,Jian Zi,J. E. Sipe,Yuen‐Ron Shen,Wei-Tao Liu,Shiwei Wu
出处
期刊:Nature Photonics
[Springer Nature]
日期:2018-05-18
卷期号:12 (7): 430-436
被引量:245
标识
DOI:10.1038/s41566-018-0175-7
摘要
Graphene with massless Dirac fermions can have exceptionally strong third-order optical nonlinearities. Yet reported values of nonlinear optical susceptibilities for third-harmonic generation (THG), four-wave mixing (FWM) and self-phase modulation vary over six orders of magnitude. Such variation likely arises from frequency-dependent resonance effects of different processes in graphene under different doping. Here, we report an experimental study of THG and FWM in graphene using gate tuning to adjust the doping level and vary the resonant condition. We find that THG and sum-frequency FWM are strongly enhanced in heavily doped graphene, while the difference-frequency FWM appears just the opposite. Difference-frequency FWM exhibited a novel divergence towards the degenerate case in undoped graphene, leading to a giant enhancement of the nonlinearity. The results are well supported by theory. Our full understanding of the diverse nonlinearity of graphene paves the way towards future design of graphene-based nonlinear optoelectronic devices. Third-harmonic generation and four-wave mixing of light can be enhanced in graphene with gate tuning to adjust the doping level. The findings may lead to new graphene-based nonlinear optoelectronic devices.
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