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Elastic waves propagating in piezoelectric materials are accompanied by atime-varying electric potential, which is of critical importance foracousto-electronic applications. The spatial mapping of such a potential atmicrowave frequencies is challenging since the characteristic length scale isdetermined by the acoustic wavelength of several micrometers. In this work, wereport the visualization of surface acoustic waves (SAWs) on ferroelectricsamples by transmission-mode microwave impedance microscopy (T-MIM). The SAWpotential launched by the interdigital transducer is detected by the tip anddemodulated by the microwave electronics as time-independent spatial patterns.Wave phenomena such as interference and diffraction are imaged and the resultsare in excellent agreement with the theoretical analysis. Our work opens up anew avenue to study various electromechanical systems in a spatially resolvedmanner.

Visualization of Surface-acoustic-wave Potential by Transmission-mode Microwave Impedance Microscopy