  Hyperbolic metamaterials create artificial optical anisotropy using metallic
wires suspended in a dielectric medium, or alternating layers of a metal and
dielectric. Here we fabricated ZnO/Al:ZnO (AZO) multilayers by the RF magnetron
sputtering deposition technique. Our fabricated multilayers satisfy the
conditions required for a type I hyperbolic metamaterial. The optical response
of individual AZO and ZnO films, as well as the multilayered film were
investigated via angular transmittance and spectroscopic ellipsometry
measurements. The optical response of the multilayered system is predicted
using the nonlocal-corrected Effective Medium Approximation (EMA). The
spectroscopic ellipsometry data of the multilayered system was modeled using a
uniaxial material model and EMA model. Both theoretical and experimental
studies validate the multilayers undergo a hyperbolic transition at a
wavelength of 2.2 {\mu}m.
