Rapid and simultaneous measurement of longitudinal and shear wave velocities by Brillouin scattering from artificially induced phonons

Abstract

For more accurate and rapid measurements of Brillouin light scattering, a technique with artificially induced acoustic phonons was proposed using a ScAIN film. The ScAIN film has a giant electromechanical coupling coefficient and can radiate coherent phonons in the sub GHz and GHz range. Making use of the induced phonons, we observed Brillouin scattering in the silica bulk sample. For efficient radiation of phonons, the ScAIN film was deposited on the side surface of the sample and reflection induced e angle geometry was used for Brillouin scattering measurements. The high intensity of Brillouin scattering from the induced acoustic phonons was experimentally studied.

Phonons induced by laser pulses for Brillouin scattering measurements

“…One solution for weak thermal phonons is the use of coherent artificial phonons as it is performed by the highresolution Bragg reflection method to increase the intensity of reflected light. 11) As reported in previous studies, 7,[12][13][14][15] we have achieved this goal by inducing phonons with a ZnO film transducer in contact with thin samples.…”