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(a) Schematic diagram of the superconducting metamaterial structure with geometrical parameters: g = t = 5 μm, w = 10 μm, a = 50 μm, and p = 60 μm. (b) Microscopy image of the superconducting terahertz metamaterial sample, where E and H represent the electric field and magnetic field.
(a) Measured amplitude transmission spectra with various incident terahertz field strengths at 4.5 K and (b) corresponding simulated spectra. (c), (d) The measured real part and imaginary part of the complex conductivity of NbN film having a same thickness of 50 nm with various incident terahertz field strengths.
The amplitude transmission spectra of NbN metamaterial with various incident terahertz electric field at (a) 10 K and (b) 13 K, respectively. (c) The measured transmission spectra under various temperatures at low incident terahertz field of E 0/16.
Effective surface reactance Xs , eff and resistance Rs , eff of the NbN film at resonance frequency of 0.45 THz from measured complex conductivity (a) as a function of the incident terahertz field strength at 4.5 K and (b) as a function of the temperature with the low Ein = E 0/16.
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