Interferometric Imaging of Nonlocal Electromechanical Power Transduction in Ferroelectric Domains

TL;DR

This paper demonstrates interferometric imaging of electromechanical power transduction in ferroelectric domains, revealing unique interference patterns caused by nonlocal electric-elastic interactions, advancing nanoscale electroacoustic research.

Contribution

It introduces a novel microwave impedance microscopy technique to visualize nonlocal electromechanical interactions in ferroelectric domains, revealing unexpected interference patterns.

Findings

Unusual one-wavelength periodic interference fringes observed

Interference patterns caused by nonlocal electric-elastic interactions

Numerical simulations confirm sign reversal effects in domains

Abstract

The electrical generation and detection of elastic waves are the foundation for acousto-electronic and acousto-optic systems. For surface-acoustic-wave devices, micro-/nano-electromechanical systems, and phononic crystals, tailoring the spatial variation of material properties such as piezoelectric and elastic tensors may bring significant improvements to the system performance. Due to the much smaller speed of sound than speed of light in solids, it is desirable to study various electroacoustic behaviors at the mesoscopic length scale. In this work, we demonstrate the interferometric imaging of electromechanical power transduction in ferroelectric lithium niobate domain structures by microwave impedance microscopy. In sharp contrast to the traditional standing-wave patterns caused by the superposition of counter-propagating waves, the constructive and destructive fringes in microwave dissipation images exhibit an intriguing one-wavelength periodicity. We show that such unusual interference patterns, which are fundamentally different from the acoustic displacement fields, stem from the nonlocal interaction between electric fields and elastic waves. The results are corroborated by numerical simulations taking into account the sign reversal of piezoelectric tensor in oppositely polarized domains. Our work paves new ways to probe nanoscale electroacoustic phenomena in complex structures by near-field electromagnetic imaging.