Visualization of acoustic power flow in suspended thin-film lithium niobate phononic devices

• Published in: Applied physics letters Vol. 119; no. 21
• Main Authors: Lee, Daehun, Meyer, Shawn, Gong, Songbin, Lu, Ruochen, Lai, Keji
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 22.11.2021
• Subjects: Acoustic propagation; Acoustic waves; Applied physics; Attenuation; Fast Fourier transformations; Fourier transforms; Lithium niobates; Piezoelectricity; Power flow; Propagation; Signal processing; Thin films; Visualization; Wave propagation

We report direct visualization of gigahertz-frequency acoustic waves in lithium niobate phononic circuits. Primary propagation parameters, such as the power flow angle and propagation loss, are measured by transmission-mode microwave impedance microscopy. Using a fast Fourier transform, we can separ...