  High permittivity SrTiO3 for the realization of all-dielectric metamaterials
operating at terahertz frequencies was fabricated. A comparison of different
processing routes evidences that Spark Plasma Sintering is the most effective
sintering process to yield high density ceramic with high permittivity. We
compare this sintering process with two others. The elaborated samples are
characterized in the low frequency and in the terahertz frequency ranges. Their
relative permittivities are compared with that a reference \sto single crystal.
The permittivity of the sample elaborated by Spark Plasma Sintering is as high
as that the single crystal.

Applied Physics;Chemical Physics