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Optical extinction and absorption enhancement in the infrared range of amonolayer graphene sheet by patterning split ring resonators (SRRs) is studied.It is found that the electric mode is stronger in enhancing infrared extinctionand absorption compared to the magnetic mode and other higher-order modes. Weimprove the infrared extinction of the SRR graphene sheet by increasing thegraphene area ratio in the SRR unit cell design. With the increase of thegraphene area ratio, the radiation ability of the electric dipolar mode anddissipation of graphene compete for a maximum infrared absorption of about 50%.The findings on enhancing infrared extinction and absorption of graphene sheetby harvesting the electric dipolar mode may have potential applications interahertz and infrared detection and modulation for graphene photonics andoptoelectronics.

Enhancing infrared extinction and absorption in a monolayer graphene sheet by harvesting the electric dipolar mode of split ring resonators