Suppression of radiation loss in high kinetic inductance superconducting co-planar waveguides

Hähnle, S.A.; van Marrewijk, N.T.; Endo, A.; Karatsu, K.; Thoen, David; Murugesan, Vignesh; Baselmans, J.J.A.

doi:10.1063/5.0005047

Suppression of radiation loss in high kinetic inductance superconducting co-planar waveguides

Journal article (2020)

Authors

S.A. Hähnle SRON–Netherlands Institute for Space Research, Tera-Hertz Sensing -

N.T. van Marrewijk Tera-Hertz Sensing -

A. Endo Kavli institute of nanoscience Delft, Tera-Hertz Sensing -

K. Karatsu Tera-Hertz Sensing - , SRON–Netherlands Institute for Space Research

David Thoen Tera-Hertz Sensing -

Vignesh Murugesan

J.J.A. Baselmans Tera-Hertz Sensing -

Research Group

Tera-Hertz Sensing () (TU Delft)

DOI: https://doi.org/10.1063/5.0005047

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Published Date

2020

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Tera-Hertz Sensing

Abstract

We present a lab-on-chip technique to measure the very low losses in superconducting transmission lines at (sub-) mm wavelengths. The chips consist of a 100 nm-thick NbTiN Co-planar Waveguide (CPW) Fabry–Pérot (FP) resonator, coupled, on one side, to an antenna and, on the other side, to a Microwave Kinetic Inductance detector. Using a single frequency radiation source allows us to measure the frequency response of the FP around 350 GHz and deduce its losses. We show that the loss is dominated by radiation loss inside the CPW line that forms the FP and that it decreases with the decreasing linewidth and increasing kinetic inductance as expected. The results can be quantitatively understood using SONNET simulations. The lowest loss is observed for a CPW with a total width of 6 μm and corresponds to a Q-factor of ≈15 000.

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