Tunability of Superconducting Metamaterials

Abstract

Metamaterials are artificial structures with unique electromagnetic properties, such as relative dielectric permittivity and magnetic permeability with values less than 1, or even negative. Because these properties are so sensitive to loss, we have developed metamaterials comprised of superconducting waveguides, wires, and split-ring resonators. An important requirement for applications of these metamaterials is the ability to tune the frequency at which the unique electromagnetic response occurs. In this paper we present three methods (unique to superconductors) to accomplish this tuning: temperature, dc magnetic field, and rf magnetic field. Data are shown for dc and rf magnetic field tuning of a single Nb split-ring resonator (SRR). It was found that the dc field tuning was hysteritic in the resonant frequency data, while the quality factor, $Q$, was less hystertic. The rf power tuning showed no hysteresis, but did show supression of the $Q$ at high power. Magneto-optical images reveal inhomogeneous magnetic vortex entry in the dc field tuning, and laser scanning photoresponse images for a YBa${}_2$Cu${}_3$O${}_{7-\delta }$ SRR reveals the current distribution in the rings.

RexTEX, 4 pages of text with 6 figures plus 1/5 page of references, submitted for the 2006 Applied Superconductivity Conference; Revised edition: spelling corrections, and we removed mention of measuring the Current Density and replaced this with a more explicit definition of what we measure (with reference)

References in corpus (5)

• Nanofabricated media with negative permeability at visible frequencies
• Superconducting Metamaterials
• Single Superconducting Split-Ring Resonator Electrodynamics
• Effect of LaAlO${}_3$ Surface Topography on RF Current Distribution in Superconducting Microwave Devices
• Imaging of Microscopic Sources of Resistive and Reactive Nonlinearities in Superconducting Microwave Devices

Cited by in corpus (29)

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• Progress in Superconducting Metamaterials
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• Imaging superconducting vortex core and lattice with the scanning tunneling microscope
• Low Loss and Magnetic Field-tuned Superconducting THz Metamaterial
• Searching For Dark Matter with Plasma Haloscopes
• Low-loss tunable metamaterials using superconducting circuits with Josephson junctions
• Miniaturized Superconducting Metamaterials for Radio Frequencies
• A one-dimensional tunable magnetic metamaterial
• Josephson junction transmission lines as tunable artificial crystals
• Realization and modeling of rf superconducting quantum interference device metamaterials
• Superconducting RF Metamaterials Made with Magnetically Active Planar Spirals
• Switching nonlinearity in a superconductor-enhanced metamaterial
• Microscopic examination of hot spots giving rise to nonlinearity in superconducting resonators
• Multistability and Self-Organization in Disordered SQUID Metamaterials
• Unconventional rf photoresponse from a superconducting spiral resonator
• Coherent Oscillations of Driven rf SQUID Metamaterials
• High-Temperature Superconducting Multi-Band Radio-Frequency Metamaterial Atoms
• Terahertz Saturable Absorption in Superconducting Metamaterials
• High-Temperature Superconducting Spiral Resonator for Metamaterial Applications
• The conditions for the preservation of duality symmetry in a linear medium
• Wide-Band Tuneability, Nonlinear Transmission, and Dynamic Multistability in SQUID Metamaterials
• Tunable negative permeability in a three-dimensional superconducting metamaterial
• Protecting SQUID metamaterials against stray magnetic field
• Imaging collective behavior in an rf-SQUID metamaterial tuned by DC and RF magnetic fields
• Tunable Superconducting Josephson Dielectric Metamaterial
• Analytical and Numerical Analysis of Linear and Nonlinear Properties of an rf-SQUID Based Metasurface
• Tuning of Strong Nonlinearity in rf SQUID Meta-Atoms