Tunable ultra-high-efficiency light absorption of monolayer graphene using critical coupling with guided resonance

摘要

We numerically demonstrate a novel monolayer graphene-based perfectabsorption multi-layer photonic structure by the mechanism of critical couplingwith guided resonance, in which the absorption of graphene can significantlyclose to 99% at telecommunication wavelengths. The highly efficient absorptionand spectral selectivity can be obtained with designing structural parametersin the near infrared ranges. Compared to previous works, we achieve thecomplete absorption of single-atomic-layer graphene in the perfect absorber forthe first time, which not only opens up new methods of enhancing thelight-graphene interaction, but also makes for practical applications inhigh-performance optoelectronic devices, such as modulators and sensors.