Abstract
High confinement of surface plasmon polaritons in graphene have important applications in many aspects. In this paper, we have demonstrated that high-quality multi-band absorption can be achieved by using a hybrid system where periodic monolayer graphene nanoribbons is coated on an all-dielectric nanostructure. The effect of the monolayer graphene nanoribbons on plasmonic resonances absorption is investigated theoretically and numerically. It is found that the high tunability and large near field enhancement of the system is observed by changing the grating period and Fermi level. After delicate optimization, the system can achieve high-Q resonances in the vicinity of the bound states in the continuum, and the Q factors of the two resonance modes are respectively significantly enhanced (＞450, 600). In addition, the multi-band light absorption enhancement with high quality can be observed by altering the carrier mobility of graphene. Wherein the optimized absorption efficiency up to 97% is reached. More interestingly, the proposed structure puts up palpable advantage in absorption stability when the incident angle is varied from 0° to 60°. Thus, this work may facilitate the design of high-performance optoelectronic devices based on all-dielectric configuration, such as tunable optical sensors and perfect absorbers.
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