Microwave Near-Field Imaging of Electric Fields in a Superconducting Microstrip Resonator

TL;DR

This paper demonstrates a cryogenic near-field microwave microscope capable of imaging microwave electric fields in superconducting and normal-metal microstrip resonators, revealing standing wave patterns at various frequencies.

Contribution

It introduces a novel cryogenic near-field microwave imaging technique for superconducting microstrip resonators with high spatial resolution.

Findings

Imaging of standing wave patterns in Cu and Tl2Ba2CaCu2O8 resonators.

Operation across a wide temperature and frequency range.

Successful visualization of microwave electric fields at fundamental and harmonic frequencies.

Abstract

We describe the use of a cryogenic near-field scanning microwave microscope to image microwave electric fields from superconducting and normal-metal microstrip resonators. The microscope employs an open-ended coaxial probe and operates from 77 to 300 K in the 0.01-20 GHz frequency range with a spatial resolution of about 200 mm. We describe the operation of the system and present microwave images of Cu and Tl2Ba2CaCu2O8 microstrip resonators, showing standing wave patterns at the fundamental and second harmonic frequencies.