We proposed a sandwich structure made of an antiferromagnetic film (AF) embedded in two graphene layers for enhancing the generation of sum frequency (SF). Our numerical results show that a maximum of SF outputs as high as 72.9 W/cm2 can be achieved with the sandwich structure at μc = 0.25 eV, which are improved two orders of magnitude compared with the single AF. The obvious SF response of the proposed structure comes from the light localization of graphene on the upper or bottom surface and also from the interference effect in the AF. In addition, the position of SF outputs can be tuned by adjusting the external magnetic field strength. Finally, the sandwich structure can be easily built in experiment. Therefore, the results in this work may extend the applications of photoelectric devices in THz fields.
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