High permittivity processed SrTiO3 for metamaterials applications at terahertz frequencies

TL;DR

This paper demonstrates that Spark Plasma Sintering effectively produces high-permittivity SrTiO3 ceramics suitable for terahertz metamaterials, matching single crystal permittivity levels.

Contribution

It identifies Spark Plasma Sintering as the optimal processing method for high-density, high-permittivity SrTiO3 ceramics for terahertz applications.

Findings

Spark Plasma Sintering yields high-density SrTiO3 with permittivity comparable to single crystals.

The processed ceramics exhibit high permittivity at terahertz frequencies.

Comparison of processing routes highlights the effectiveness of Spark Plasma Sintering.

Abstract

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.