Detection of electron spin resonance down to 10 K using localized spoof surface plasmon

TL;DR

This paper demonstrates a novel method using localized spoof surface plasmon modes on a metallic spiral resonator to detect electron spin resonance at temperatures as low as 10 K, with potential applications in spin detection.

Contribution

It introduces a new resonator design employing spoof surface plasmons for ESR detection, extending operational temperature range and sensitivity.

Findings

Successful ESR detection at 10 K

Resonator exhibits temperature-dependent mode characteristics

Potential for microwave Rashba field-driven ESR detection

Abstract

In this study, novel use of the electromagnetic field profile of a localized spoof surface plasmonic mode to detect electron spin resonance is being reported. The mode is supported on a resonator with a complementary metallic spiral structure, etched on the ground plane of a microstrip line having a characteristic impedance of 50 $\Omega$. The change in characteristics of the mode of interest with lowering of temperature has been observed and analyzed. Electron spin resonance spectra of a standard paramagnetic sample, 2,2-diphenyl-1-picrylhydrazyl, are recorded using this resonator down to 10 K. Potential application of the mode in the detection of microwave Rashba field-driven electron spin resonance has been discussed.