Seminar Announcement: Tindaro Ioppolo
Data pubblicazione: 14-giu-2018 13.54.55
Wednesday, 13 June 2018, 10:30
Sala Grande Palazzina B via alla Cascata 56/C
"Magnetostrictive and electrostrictive optical cavities"
Bobby Lyle School of Engineering, Department of Mechanical Engineering,
Southern Methodist University Dallas, Texas, USA
The effect of electric and magnetic field on the optical resonances of electrostrictive and magnetostrictive optical resonators is presented. The electrostrcitve or the magnetostrictive effect is the elastic deformation of a solid when subject to an electric or magnetic field. The optical resonator has a spherical shape and a diameter of a few hundred micrometers. The resonator is fabricated using a polymeric matrix made of Polyvinyl Chloride (PVC) Plastisol with embedded magnetically polarizable micro-particles. When the optical resonator is exposed to an external electric or magnetic field, the morphology (radius and refractive index) of the resonator is perturbed by the magnetic or electric forces acting on it, leading to a shift of the optical resonances also known as whispering gallery modes (WGM). In this study, the effect of a static and harmonic magnetic and electric field on the optical mode shift is investigated. The optical resonances obtained with the PVC plastisol resonator showed a quality factor of ~106. The optical shift in turn is monitored and related to the external effect. Sensors based on this concept will be presented for different applications.