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Evaluation of kinetic-inductance nonlinearity in a single-crystal NbTiN-based coplanar waveguide

Masanori Takeda, Takafumi Kojima, Atsushi Saito, Kazumasa Makise, Hisashi Shimakage
2016 Proc. 14th Int. Conf. on Global Research and Education, Inter-Academia 2015   unpublished

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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
more » ... ting 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.
doi:10.7567/jjapcp.4.011502 fatcat:aqjayr2hzfep5dd3nwrphwvauu
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Masanori Takeda, Takafumi Kojima, Atsushi Saito, Kazumasa Makise, Hisashi Shimakage. "Evaluation of kinetic-inductance nonlinearity in a single-crystal NbTiN-based coplanar waveguide." Proc. 14th Int. Conf. on Global Research and Education, Inter-Academia 2015 (2016)