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We exploited graphene nanoribbons based meta-surface to realize coherentperfect absorption (CPA) in the mid-infrared regime. It was shown thatquasi-CPA frequencies, at which CPA can be demonstrated with proper phasemodulations, exist for the graphene meta-surface with strong resonantbehaviors. The CPA can be tuned substantially by merging the geometric designof the meta-surface and the electrical tunability of graphene. Furthermore, wefound that the graphene nanoribbon meta-surface based CPA is realizable withexperimental graphene data. The findings of CPA with graphene meta-surface canbe generalized for potential applications in optical detections and signalprocessing with two-dimensional optoelectronic materials.

Tunable mid-infrared coherent perfect absorption in a graphene meta-surface