Microwave induced phonons imaging by Brillouin microscopy

Bulk Acoustic Waves (BAW) as well as Surface Acoustic Waves (SAW) have been studied by Brillouin Spectroscopy (BS). Experiments performed on Lithium Niobate single crystals and Zinc Oxide thin films have pointed out that BS is able to detect piezoelectrically induced phonons. Propagation losses and spatial acoustic field distribution have then been measured. Results are compared with previous ones obtained with other methods.