Open AccessTunable and high quality factor Fano and toroidal dipole resonances in terahertz superconducting metamaterials
Author(s) -
Siyu Duan,
Jingbo Wu,
Ze Xiang Shen,
Yun Guan,
Xiaoqing Jia,
Caihong Zhang,
Biaobing Jin,
Lin Kang,
Wei Xu,
Huabing Wang,
Jian Chen,
Peiheng Wu
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab85fa
Subject(s) - metamaterial , terahertz radiation , fano resonance , kinetic inductance , niobium nitride , q factor , dipole , condensed matter physics , superconductivity , resonator , materials science , split ring resonator , resonance (particle physics) , optoelectronics , plasmon , physics , optics , inductance , nitride , atomic physics , nanotechnology , quantum mechanics , voltage , layer (electronics)
We experimentally studied a series of terahertz (THz) metamaterials with asymmetric resonator structures made from superconducting niobium nitride or gold films. Fano and toroidal dipole resonances are excited in superconducting metamaterials and their quality factors are higher in comparison with those of gold samples. Superconducting samples possess good tuning behaviors for both Fano and toroidal dipole resonance frequencies due to the change of kinetic inductance under different temperatures. The superconducting samples also exhibit good slow light effect due to the sharp dispersion in transmission spectra. These tunable and low loss metamaterials possess great significance to the development of THz nonlinear and slow light devices.