Superconductors in plasmonics and metamaterials: some experimental data

M. Gombos; S. Romano; I. Rendina; R. Ciancio; G. Carapella; V. Mocella

doi:10.1117/12.2018332

6 May 2013 Superconductors in plasmonics and metamaterials: some experimental data

M. Gombos, S. Romano, I. Rendina, R. Ciancio, G. Carapella, V. Mocella

Proceedings Volume 8771, Metamaterials VIII; 87711B (2013) https://doi.org/10.1117/12.2018332
Event: SPIE Optics + Optoelectronics, 2013, Prague, Czech Republic

Abstract

High frequencies (visible and near infrared) applications of metamaterials and plasmonic structures are strongly limited by dissipative losses in structures, due to poor conductivity of most used metals in this frequency range. The use of high temperature superconductors (HTSC) is a possible approach to this problem, being HTSC plasmonic materials at nonzero temperature. Negative dielectic constant and variety of charge carriers (electrons or holes) are further very attractive features for plasmonic applications. Characterization of the high frequency response of these materials is then necessary in order to correctly understand the optical parameters of HTSC. We report on FTIR and ellipsometry measurements on NdBa₂Cu₃O_7-δ (Nd123) and the ruthenocuprate superconductor GdSr₂RuCu2O_8-δ (Gd1212) in optical and near infrared regime. Among YBCO-like cuprate superconductors, Nd123 presents the highest Tc (96K), and the most interesting magnetic response properties. Even more interesting, in view of use for metamaterial, is Gd1212, whose main characteristic is the coexistence, in the same cell, of superconductivity and magnetic order below Tc: Ru ions intrinsic magnetic moments order themselves below 135K, whereas superconductivity onset is at about 40K, depending on fabrication details. We performed measurements on Melt-Textured bulk samples, which present the best superconducting properties. Results confirm the promising feature of the considered materials; further analyses, also on powders and films, are in progress.

Citation Download Citation

M. Gombos, S. Romano, I. Rendina, R. Ciancio, G. Carapella, and V. Mocella "Superconductors in plasmonics and metamaterials: some experimental data", Proc. SPIE 8771, Metamaterials VIII, 87711B (6 May 2013); https://doi.org/10.1117/12.2018332

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