Tunable near-infrared epsilon-near-zero and plasmonic properties of Ag-ITO co-sputtered composite films.

ABSTRACT: Series of co-sputtered silver-indium tin oxide (Ag-ITO) films are systematically fabricated. By tuning the atomic ratio of silver, composite films are manifested to have different microstructures with limited silver amount (<3 at.%). Two stages for film morphology changing are proposed to describe different status and growth mechanisms. The introduction of silver improves the preferred orientations of In₂O₃ component significantly. Remarkably, dielectric permittivity of Ag-ITO films is highly adjustable, allowing the cross-over wavelengths λ_c to be changed by more than 300 nm through rapid post-annealing, and thus resulting in tunable epsilon-near-zero and plasmonic properties in the near-infrared region. Lower imaginary permittivity compared

SUBMITTER: Chen C 

PROVIDER: S-EPMC5827799 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature