Tunable Absorption Enhancement with Graphene Nanodisk Arrays

Extended single-layer graphene has weak optical absorption at visible and infrared wavelengths, which severely reduces its potential for optoelectronic applications. Here, by tailoring a graphene layer into an array of closely packed graphene nanodisks, we improve its absorption efficiency from less than 3{\%} to 30{\%} in the infrared region of the spectrum. In addition, we demonstrate that this enhanced absorption depends on nanodisk size, interparticle spacing and voltage-driven electrostatic doping.[1] These finding suggests that graphene nanomaterials are promising media for infrared electro-optic devices. \\[4pt] [1] Z.Y. Fang et al., Nano Lett. 14(2014)10.1021/nl404042h