Self-Rolling SiO_2/Au Based Epsilon-Near-Zero Metamaterial

摘要

Wave propagation in epsilon-near-zero (ENZ) media offers exciting possibilitiesin the field of nanophotonics. Here, a thin film self-rolling technique tofabricate SiO_2/Au based 3D multilayer structures is implemented. Thesecylindrical multilayer metamaterials are utilized to take advantage of thematerial dispersion as well as the structural dispersion to obtain self-rollingENZ metamaterials at the visible to near-infrared wavelength range. The ENZfeatures are investigated initially by modelling the dispersion of the effectivemedium using circular effective medium approximation and further bythe characterization of the optical response. Moreover, the potential of thesestructures for supporting an ENZ waveguide mode is demonstrated. Thisplatform for dispersion engineering and obtaining ENZ metamaterials canprovide opportunities for unique applications which cannot be possible withplanar systems. It can be used to integrate active materials before the rollingprocess to actively control the layer properties, or embed single-layer materialswithin different layers of ENZ metamaterials with potential applicationsin quantum nanophotonics.