▎ 摘　　要

Graphene has emerged as a promising material for subwavelength photonics, among other reasons because of its large tunability, extreme confinement of plasmonic modes, and limited losses. Here we use the interplay of time modulation and plasmonic resonances in graphene gratings to efficiently generate frequency combs. By using rigorous simulations and a coupled-mode theory model, we show that the combs can be strongly tailored via both the grating and time modulation properties, and can range from the mid-infrared to far-infrared. The grating properties, via the resonance lifetime, strongly influence the conversion efficiency, while the temporal modulation defines the comb's frequency spacing and shape. We examine in detail the dynamics of this interplay between cavity and modulation. With the grating mechanism, a similar frequency comb generation is obtained with a modulation amplitude that is three orders of magnitude smaller than in the planar case.