Superconductive Ultra-compact Magnetically Coupled Resonator with Twin-spiral Structure

TL;DR

This paper presents a novel ultra-compact superconductive micro-resonator with a twin-spiral structure, demonstrating its potential for use in metamaterials, filters, and coupling circuits due to its extremely small size and confirmed resonance properties.

Contribution

The paper introduces a new design of a superconductive micro-resonator with a twin-spiral structure, achieving unprecedented miniaturization and validated through simulation and experimental methods.

Findings

Resonator size is about λ/14400, extremely compact.

Resonance frequencies and inner modes confirmed experimentally.

Design is suitable for superconductive filters and metamaterials.

Abstract

We describe a practical design of an ultra-compact on-chip superconductive micro-resonator as a potential magnetic element of metamaterial. The achieved resonator size with respect to the wavelength in our experiment is about {\lambda}/ 14400. The resonator consists of two superconducting Nb spirals, sandwiched face to face, with a small gap filled with dielectric. The spirals are turning in opposite directions: one clockwise, another counter-clockwise. We study the resonator spectral response and its inner modes using numerical simulation in HFSS. In experiment with a Laser Scanning Microscope (LSM) we confirm the predictions for the resonance frequencies of Nb superconductive resonator and its inner modes structures. Small size and the ease of manufacturing make the two-spiral resonator an attractive solution for superconductive filters, coupling circuits, and as a magnetic component of a metamaterial.