Localized microwave resonances in strained SrTiO3 thin films

TL;DR

This study investigates localized microwave resonances in strained SrTiO3 thin films using time-resolved optical microscopy, revealing spatially and frequency-localized resonances in the 2-4 GHz range.

Contribution

It introduces a novel optical microscopy method to probe localized microwave resonances in strained oxide thin films with high spatial and frequency resolution.

Findings

Resonances are localized in space and frequency.

Resonances observed in the 2-4 GHz range.

Method achieves sub-micron spatial resolution.

Abstract

The frequency-dependent polar dynamics of strained SrTiO3 films grown on DyScO3 are investigated using time-resolved confocal scanning optical microscopy. Microwave frequency electric fields are synchronized with a mode-locked laser and applied in-plane to the sample, while the temporal response is probed optically. Local spectroscopic information is obtained with <1 um spatial resolution over the frequency range 2-4 GHz. Investigation of the SrTiO3/DyScO3 system reveals resonances that are localized both in space and in frequency.