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.

arXiv comment8 pages, 7 figures

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• Imaging the Anisotropic Nonlinear Meissner Effect in Nodal YBa${}_2$Cu${}_3$O${}_{7-\delta }$ Thin-Film Superconductors
• Electrodynamics of a ring-shaped spiral resonator
• High-Temperature Superconducting Spiral Resonator for Metamaterial Applications
• High-Temperature Superconducting Multi-Band Radio-Frequency Metamaterial Atoms
• Tunable negative permeability in a three-dimensional superconducting metamaterial
• Microwave Nonlinearity and Photoresponse of Superconducting Resonators with Columnar Defect Micro-Channels
• Imaging the paramagnetic nonlinear Meissner effect in nodal gap superconductor
• Dielectric Resonator Method For Determining Gap Symmetry Of Superconductors Through Anisotropic Nonlinear Meissner Effect
• Compact inductor-capacitor resonators at sub-gigahertz frequencies
• Bulk properties of honeycomb lattices of superconducting microwave resonators
• Phase-resolved visualization of radio-frequency standing waves in superconducting spiral resonator for metamaterial applications