Continuous Tera-Hertz wave transmission spectroscopy of Nb double superconducting split-ring resonator array

Transmission spectroscopy of two Nb double superconducting split-ring samples with different thicknesses on MgO substrates was measured by a continuous Tera-Hertz spectrometer. The transmission curves of two different samples with the thicknesses of 50 and 150 nm at 7.5 K show dips at 480, 545 GHz,...

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Bibliographic Details
Published in:Science China. Physics, mechanics & astronomy mechanics & astronomy, 2012-02, Vol.55 (2), p.224-227
Main Authors: Zuo, JunWei, Liu, RuiYuan, Zhou, YuRong, Li, YanRong, Wang, YunPing
Format: Article
Language:English
Subjects:
Arrays
Astronomy
Classical and Continuum Physics
Dipping
Fluids
Inductance
Magnesium oxide
Niobium
Observations and Techniques
Physics
Physics and Astronomy
Spectroscopy
Substrates
Superconductivity
Superfluidity
Thickness
传输行为
双波
太赫兹
开环谐振器
超导输电
透射光谱
铌
阵列
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Summary:Transmission spectroscopy of two Nb double superconducting split-ring samples with different thicknesses on MgO substrates was measured by a continuous Tera-Hertz spectrometer. The transmission curves of two different samples with the thicknesses of 50 and 150 nm at 7.5 K show dips at 480, 545 GHz, respectively, which origin from the different capacities and inductances of the samples. For the sample of 50 nm, the dip shifts to lower frequency, also decreases in depth and increases in width with temperature or field increasing below Tc of Nb film, while the sample of 150 nm does not show such a phenomenon. This thickness-dependent transmission behavior is due to the kinetic inductance and conductivity change of superfluid electrons in Nb film and may suggest a practical tunable THz filter based on the thinner samples.
ISSN:1674-7348
1869-1927
DOI:10.1007/s11433-011-4562-z