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arXiv · 1608.06122

Metallic coplanar resonators optimized for low-temperature measurements

Mojtaba Javaheri Rahim·Thomas Lehleiter·Daniel Bothner·Cornelius Krellner·Dieter Koelle·Reinhold Kleiner·Martin Dressel·Marc Scheffler
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Abstract

Metallic coplanar microwave resonators are widely employed at room temperature, but their low-temperature performance has received little attention so far. We characterize compact copper coplanar resonators with multiple modes from 2.5 to 20 GHz at temperatures as low as 5 K. We investigate the influence of center conductor width (20 to 100 {\mu}m) and coupling gap size (10 to 50 {\mu}m), and we observe a strong increase of quality factor (Q) for wider center conductors, reaching values up to 470. The magnetic-field dependence of the resonators is weak, with a maximum change in Q of 3.5% for an applied field of 7 T. This makes these metallic resonators well suitable for magnetic resonance studies, as we document with electron spin resonance (ESR) measurements at multiple resonance frequencies.

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Mojtaba Javaheri Rahim, Thomas Lehleiter, Daniel Bothner, Cornelius Krellner, Dieter Koelle, Reinhold Kleiner, Martin Dressel, Marc Scheffler. 2016-08-22. Metallic coplanar resonators optimized for low-temperature measurements. https://doi.org/10.1088/0022-3727/49/39/395501

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