Tunable and high quality factor Fano and toroidal dipole resonances in terahertz superconducting metamaterials | Zendy

Siyu Duan | Zendy; Jingbo Wu | Zendy; Zexiang Shen | Zendy; Yun Guan | Zendy; Xiaoqing Jia | Zendy; Caihong Zhang | Zendy; Biaobing Jin | Zendy; Lin Kang | Zendy; Weiwei Xu | Zendy; Huabing Wang | Zendy; Jian Chen | Zendy; Peiheng Wu | Zendy

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Tunable and high quality factor Fano and toroidal dipole resonances in terahertz superconducting metamaterials

Author(s) -

Siyu Duan,

Jingbo Wu,

Zexiang Shen,

Yun Guan,

Xiaoqing Jia,

Caihong Zhang,

Biaobing Jin,

Lin Kang,

Weiwei 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) - terahertz radiation , metamaterial , fano resonance , kinetic inductance , niobium nitride , q factor , resonator , dipole , materials science , superconductivity , optoelectronics , condensed matter physics , resonance (particle physics) , plasmon , terahertz spectroscopy and technology , split ring resonator , optics , physics , 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.

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