Four-wave mixing of topological edge plasmons in graphene metasurfaces
Four-wave mixing of topological edge plasmons in graphene metasurfaces
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DOI：
10.1126/sciadv.aaz3910
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发表时间：
2019-08
期刊：
影响因子：
13.6
通讯作者：
J. You;Z. Lan;N. Panoiu
中科院分区：
文献类型：
--
作者：
J. You;Z. Lan;N. Panoiu
它表明，净光学增益可以通过拓扑保护的四波混频在石墨烯超颖表面实现。我们研究拓扑保护的四波混频（FWM）相互作用在等离子体元表面组成的周期性阵列的纳米孔在石墨烯片，表现出宽的拓扑带隙在太赫兹频率时，由静磁场的时间反转对称性的破坏。我们表明，由于显着的非线性增强和大的寿命的石墨烯等离子体在特定的配置，位于拓扑带隙中的等离子体边缘状态的FWM相互作用的净增益可以实现小于10 nW的泵浦功率。特别地，我们发现有效非线性边缘波导系数约为γ = 1.1 × 1013 W−1 m−1，即，比通常使用的高度非线性硅光子纳米线大10个数量级以上。这些发现可以为开发超低功耗，高度集成和鲁棒的深亚波长有源光子系统铺平新的道路，用于量子通信和信息处理。
It is demonstrated that net optical gain can be achieved via topologically protected four-wave mixing in a graphene metasurface. We study topologically protected four-wave mixing (FWM) interactions in a plasmonic metasurface consisting of a periodic array of nanoholes in a graphene sheet, which exhibits a wide topological bandgap at terahertz frequencies upon the breaking of time reversal symmetry by a static magnetic field. We demonstrate that due to the significant nonlinearity enhancement and large life time of graphene plasmons in specific configurations, a net gain of FWM interaction of plasmonic edge states located in the topological bandgap can be achieved with a pump power of less than 10 nW. In particular, we find that the effective nonlinear edge-waveguide coefficient is about γ ≃ 1.1 × 1013 W−1 m−1, i.e., more than 10 orders of magnitude larger than that of commonly used, highly nonlinear silicon photonic nanowires. These findings could pave a new way for developing ultralow-power-consumption, highly integrated, and robust active photonic systems at deep-subwavelength scale for applications in quantum communications and information processing.