Abstract
Graphene consists of a single layer of carbon atoms with a two-dimensional hexagonal lattice structure. Recently, it has
been the subject of increasing interest due to its excellent optoelectronic properties and interesting physics. Graphene is
considered to be a promising material for use in optoelectronic devices due to its fast response and broadband
capabilities. However, graphene absorbs only 2.3% of incident white light, which limits the performance of
photodetectors based on it. One promising approach to enhance the optical absorption of graphene is the use of
plasmonic resonance. The field of plasmonics has been receiving considerable attention from the viewpoint of both
fundamental physics and practical applications, and graphene plasmonics has become one of the most interesting topics
in optoelectronics. In the present study, we investigated the optical properties of graphene on a plasmonic metamaterial
absorber (PMA). The PMA was based on a metal-insulator-metal structure, in which surface plasmon resonance was
induced. The graphene was synthesized by chemical vapor deposition and transferred onto the PMA, and the reflectance
of the PMA in the infrared (IR) region, with and without graphene, was compared. The presence of the graphene layer
was found to lead to significantly enhanced absorption only at the main plasmon resonance wavelength. The localized
plasmonic resonance induced by the PMA enhanced the absorption of graphene, which was attributed to the
enhancement of the total absorption of the PMA with graphene. The results obtained in the present study are expected to
lead to improvements in the performance of graphene-based IR detectors.
