论文标题
在高度工程的石墨烯构造量元毛面中，SHG和THG的可调和双宽带巨型增强
Tunable and Dual-broadband Giant Enhancement of SHG and THG in a Highly-engineered Graphene-Insulator-Graphene Metasurface
论文作者
论文摘要
我们展示了一种新的方案，可以显着增强石墨烯 - 胰蛋白酶 - 透明质元表面中的第二次和第三次产生。我们方法的主要基础特征是存在双共振现象，即元表面旨在在基本频率和较高谐波的情况下具有基本的等离子体共振。特别是，在两个光学频率上的这种双谐振场增强，结合了光学近场的有利的空间重叠，从而导致产生的较高谐波增加了几个数量级。值得注意的是，我们证明，通过调整石墨烯光栅的费米能，双谐和可以在〜20 THz的广泛频谱范围内锁定，同样重要的是，可以在第二和第三次谐波之间轻松地在同一设备中切换增强的非线性频率生成过程。这种新型的石墨烯元表面可以为开发新型的超紧凑和多频活动光子纳米电视开发新的途径。
We demonstrate a novel scheme to dramatically enhance both the second- and third-harmonic generation in a graphene-insulator-graphene metasurface. The key underlying feature of our approach is the existence of a double-resonance phenomenon, namely the metasurface is designed to possess fundamental plasmon resonances at both the fundamental frequency and the higher harmonic. In particular, this dual resonant field enhancement at the two optical frequencies, combined with a favorable spatial overlap of the optical near-fields, lead to the increase of the generated higher harmonic by several orders of magnitude. Remarkably, we demonstrate that by tuning the Fermi energy of the graphene gratings the dual-resonance property can be locked-in over a broad spectral range of ~20 THz, and equally important, the enhanced nonlinear frequency generation process can be readily switched in the same device between the second and third harmonic. This new type of graphene metasurface could open up new avenues towards the development of novel ultra-compact and multi-frequency active photonic nanodevices.
