Tunable Plasmonic Absorber Based on TiN-Nanosphere Liquid Crystal Hybrid in Visible and Near-Infrared Regions

in this paper, a tunable plasmonic absorber based on tin-nanosphere/liquid crystal (lc) nanocomposite in visible and near-infrared regions is proposed. tin-nanosphere/lc nanocomposite is a combination of titanium nitride (tin) nanospheres dispersed in a host of lc and plays the main role in post fabrication tunability. the proposed absorber has three more than 90% absorption peaks and the absorption tunability of about 76 nm. it is shown that tin-nanospheres are able to support localized surface plasmon resonance (lspr). the maxwell-garnett theory is utilized to approximate the permittivity of the composite structure. also, the effect of geometric parameters on the absorption is studied. moreover, a single sheet of graphene is utilized to compensate the decrement of the absorption caused by the geometric parameters.