Visualization of acoustic power flow in suspended thin-film lithium niobate phononic devices
Abstract
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 separately analyze forward and backward propagating waves and quantitatively evaluate the propagation loss. Our work provides insightful information on the propagation, diffraction, and attenuation in piezoelectric thin films, which is highly desirable for designing and optimizing phononic devices for microwave signal processing.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 22, 2021
- Source ID
- 10.1063/5.0073530
Entities
People
- Daehun Lee
- Keji Lai
- Ruochen Lu
- Shawn Meyer
- Songbin Gong
Organizations
- Defense Advanced Research Projects Agency
- Division of Materials Research
- Robert A. Welch Foundation
- University of Illinois Urbana–Champaign
- University of Texas at Austin