Unconventional rf photoresponse from a superconducting spiral resonator

Abstract

Superconducting thin film resonators employing strip geometries show great promise in rf/microwave applications due to their low loss and compact nature. However, their functionality is limited by nonlinear effects at elevated rf/microwave powers. Here, we show that by using a planar spiral geometry carrying parallel currents in adjacent turns, this limitation can be minimized. We investigate the rf current distributions in spiral resonators implemented with Nb thin films via laser scanning microscopy. The rf current density profile along the width of the individual turns of the resonators reveals an unconventional trend: maximum current in the middle of the structure and decaying toward its edges. This unusual behavior is associated with the circular nature of the geometry and the cancellation of magnetic field between the turns, which is favorable for handling high powers since it allows the linear characteristics to persist at high rf current densities.

8 pages, 7 figures

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• The Physics and Applications of Superconducting Metamaterials
• Tunability of Superconducting Metamaterials
• Measuring the Decoherence of a Quantronium Qubit with the Cavity Bifurcation Amplifier
• Thin film dielectric microstrip kinetic inductance detectors
• Effect of LaAlO3 twin-domain topology on local dc and microwave properties of cuprate films
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• High-Temperature Superconducting Multi-Band Radio-Frequency Metamaterial Atoms
• High-Temperature Superconducting Spiral Resonator for Metamaterial Applications
• Tunable negative permeability in a three-dimensional superconducting metamaterial
• Dielectric Resonator Method For Determining Gap Symmetry Of Superconductors Through Anisotropic Nonlinear Meissner Effect
• Compact inductor-capacitor resonators at sub-gigahertz frequencies
• Phase-resolved visualization of radio-frequency standing waves in superconducting spiral resonator for metamaterial applications