Fig. 6From: High-Efficiency Plasmonic Third-Harmonic Generation with Graphene on a Silicon Diffractive Grating in Mid-infrared Regiona The maximum CE of THG as a function of the incident power density for Np = 3. b The maximum CE and the maximum output power density of THG as a function of the number of grating periods Np used, respectively. The incident power density is fixed at 0.11 MW/cm2Back to article page