1. Visualization of Acoustic Power Flow in Suspended Thin-film Lithium Niobate Phononic Devices
- Author
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Songbin Gong, Ruochen Lu, Shawn Meyer, Daehun Lee, and Keji Lai
- Subjects
Diffraction ,Materials science ,Condensed Matter - Mesoscale and Nanoscale Physics ,Physics and Astronomy (miscellaneous) ,Attenuation ,Acoustics ,Lithium niobate ,FOS: Physical sciences ,Acoustic wave ,Sound power ,chemistry.chemical_compound ,Condensed Matter::Materials Science ,chemistry ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,Thin film ,Electrical impedance ,Microwave - Abstract
We report direct visualization of gigahertz-frequency acoustic waves in lithium niobate phononic circuits. Primary propagation parameters, such as the power flow angle (PFA) and propagation loss (PL), are measured by transmission-mode microwave impedance microscopy (TMIM). Using 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., Comment: 12 pages, 4 figures
- Published
- 2021
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