High-Efficiency Plasmonic Third-Harmonic Generation with Graphene on a Silicon Diffractive Grating in Mid-infrared Region

The scheme of the GSSDG as a THG wavelength converter. The FF GPs (red curves) are excited with a normal-incidence x-polarized plane wave of FF and then generate the THF GPs (blue curves) due to the silicon gratings underneath the graphene sheets. The period of the grating is p, and w denotes the width of silico