title: Low loss and magnetic field-tunable superconducting terahertz metamaterial.
abstract: Superconducting terahertz (THz) metamaterial (MM) made from niobium (Nb) film has been investigated using a continuous-wave THz spectroscopy. The quality factors of the resonance modes at 0.132 THz and 0.418 THz can be remarkably increased when the working temperature is below the superconducting transition temperature of Nb, indicating that the use of superconducting Nb is a possible way to achieve low loss performance of a THz MM. In addition, the tuning of superconducting THz MM by a magnetic field is also demonstrated, which offers an alternative tuning method apart from the existing electric, optical and thermal tuning methods.
authors: Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.
authors: Biaobing
authors: B
authors: Jin
authors: Caihong
authors: C
authors: Zhang
authors: Sebastian
authors: S
authors: Engelbrecht
authors: Andrei
authors: A
authors: Pimenov
authors: Jingbo
authors: J
authors: Wu
authors: Qinyin
authors: Q
authors: Xu
authors: Chunhai
authors: C
authors: Cao
authors: Jian
authors: J
authors: Chen
authors: Weiwei
authors: W
authors: Xu
authors: Lin
authors: L
authors: Kang
authors: Peiheng
authors: P
authors: Wu
mesh_terms: D003198:Computer Simulation; D004867:Equipment Design; D008280:Magnetics; D009556:Niobium; D055053:Terahertz Radiation; D055068:Terahertz Spectroscopy / Q000295:instrumentation*
chemical_list: D009556:Niobium