Seminar Announcement: Patrice Salzenstein
Data pubblicazione: 13-set-2018 7.43.37
Tuesday, 11 September 2018, 10:30
Sala Grande Palazzina C via alla Cascata 56/C
"Brillouin light scattering for the characterization of bulk and surface elastic waves"
Institut FEMTO-ST 15B Avenue des Montboucons 25030 BESANÇON CEDEX,
Brillouin scattering reveals acoustic or spin-wave frequencies in the microwave frequency domain. Brillouin light scattering (BLS) setup deals with the detection and analysis of laser light scattered by fluctuations of refracting index in a medium. It consists in analysis of the refracted light emitted by a material. Tandem Fabry–Perot interferometer produces peaks shifted from the frequency of the laser to characteristic frequencies depending on the material. As a way of calibration, we can characterized different bulk materials such as for example glass, PMMA, nylon, polypropylene, Lithium-aluminosilicate glass ceramic or thin layers. From BLS we can deduce parameters of the material like phase velocity of transverse and longitudinal waves.