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Terahertz nonlinear superconducting metamaterials
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View: Figures


Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz nonlinear superconducting metamaterials