It is difficult to perform two-dimensional imaging of elastic properties using Brillouin scattering technique because the weak thermal phonon signal in the sample leads to low measurement accuracy and long measurement times. To improve the phonon signal, we artificially induced acoustic phonons using a ScAlN thin-film piezoelectric transducer, which has a giant piezoelectricity. The film was grown using RF magnetron sputtering of a ScAl alloy target on a silica glass bar sample. Using a microwave probe, the electric power applied to the film was 1 mW at 875 MHz. We obtained the enhancement of Brillouin scattering signal in the silica glass bar sample due to the induced phonons. Compared with without the induced phonons from the ScAlN film transducer, the peak intensity improved by nearly three orders of magnitude. This technique can significantly shorten the time required for Brillouin scattering measurements.
|Journal||IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control|
|Publication status||Accepted/In press - 2018 Jul 18|
ASJC Scopus subject areas
- Acoustics and Ultrasonics
- Electrical and Electronic Engineering