Yuancheng Fan, Zeyong Wei, Zhengren Zhang, Hongqiang Li
Optical extinction enhancement at infrared range in a single graphene sheet by patterning split ring resonators (SRRs) is studied. It is found that electric dipole mode is stronger in enhancing infrared extinction compared with magnetic mode and higher order modes. We suggest to improve infrared extinction of the SRR graphene sheet by increasing the graphene area ratio to the unit cell, and with the increase of the graphene area ratio radiation ability of the electric dipole mode and dissipation of graphene will competing for a maximum infrared absorption of about 50%. The findings on enhancing infrared extinction of graphene sheet by harvesting the electric dipole mode may have potential applications in terahertz and infrared detection and modulation for graphene photonics and optoelectronics.
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http://arxiv.org/abs/1306.2982
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