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

TL;DR

This paper demonstrates that patterning split ring resonators on a monolayer graphene sheet significantly enhances infrared extinction and absorption by harnessing the electric dipolar mode, with potential applications in photonics.

Contribution

It introduces a design method that increases infrared absorption in graphene by optimizing the electric dipolar mode through SRR patterning.

Findings

Electric mode is more effective than magnetic mode in enhancing IR extinction.

Increasing graphene area ratio boosts electric dipolar radiation and absorption.

Maximum IR absorption reaches about 50% with optimized design.

Abstract

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