We investigate the nonlinear optical third harmonic generation of sinusoidal curved graphene which is placed on the dielectric substrate. Under transverse magnetic polarization, the third harmonic generation (THG) from graphene is dramatically enhanced at fundamental-mode and several higher-order modes of surface plasmon of graphene. The enhancement factor of THG is up to106 compared to that from graphene on a planar dielectric. We study in detail THG intensity affected by the Fermi level of graphene, grating period and amplitude, and the angle of incidence of light. The tunable and enhanced THG response at multiple wavelengths show that the sinusoidal-shaped graphene grating has potential applications for graphene based broadband nonlinear photonics.

中文翻译：

---

正弦石墨烯光栅增强三次谐波产生

我们研究了放置在介电基板上的正弦曲线石墨烯的非线性光学三次谐波生成。在横向磁极化下，石墨烯的三次谐波产生（THG）在石墨烯表面等离子体的基模和几种高阶模式下显着增强。与平面电介质上的石墨烯相比，THG 的增强因子高达 106。我们详细研究了受石墨烯费米能级、光栅周期和振幅以及光入射角影响的 THG 强度。多波长下可调谐和增强的 THG 响应表明，正弦形石墨烯光栅具有基于石墨烯的宽带非线性光子学的潜在应用。