JJAP Conference Proceedings
Online ISSN : 2758-2450
14th International Conference on Global Research and Education, Inter-Academia 2015
Session ID : 011502
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Optics and electromagnetic wave
Evaluation of kinetic-inductance nonlinearity in a single-crystal NbTiN-based coplanar waveguide
Masanori TakedaTakafumi KojimaAtsushi SaitoKazumasa MakiseHisashi Shimakage
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Abstract

We have developed a kinetic inductance travelling-wave amplifier toward the THz-band operation. In this paper, we discuss the nonlinear kinetic inductance of single-crystal niobium titanium nitride (NbTiN) thin film in response to the application of current to the film. In our calculation, it is found that single-crystal NbTiN films have a large current variation in the kinetic inductance compared with that of polycrystalline NbTiN films. To evaluate the nonlinearity, we fabricated a superconducting coplanar waveguide with a 0.2-m line length and measured the transmittance. We observed a variation of the electrical length of the line caused by the modulation of the kinetic inductance as a function of the value of the current applied to the strip.

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