Tuning the Resonance in High Temperature Superconducting Terahertz Metamaterials

TL;DR

This paper demonstrates temperature-controlled resonance tuning in high-temperature superconducting terahertz metamaterials, revealing new features and providing a theoretical model for resonance behavior and switching efficiency.

Contribution

It introduces a comprehensive theoretical model explaining resonance tuning in superconducting metamaterials, validated by experiments and simulations, with insights into optimizing resonance switching.

Findings

Resonance switching and frequency tuning are achieved by temperature variation.

Theoretical model explains the influence of complex conductivity on resonance.

Thinner superconducting split-ring resonators enhance resonance tuning efficiency.

Abstract

In this Letter we present resonance properties in terahertz metamaterials consisting of a split-ring resonator array made from high temperature superconducting films. By varying the temperature, we observed efficient metamaterial resonance switching and frequency tuning with some features not revealed before. The results were well reproduced by numerical simulations of metamaterial resonance using the experimentally measured complex conductivity of the superconducting film. We developed a theoretical model that explains the tuning features, which takes into account the resistive resonance damping and additional split-ring inductance contributed from both the real and imaginary parts of the temperature-dependent complex conductivity. The theoretical model further predicted more efficient resonance switching and frequency shifting in metamaterials consisting of a thinner superconducting split-ring resonator array, which were also verified in experiments.