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Seminar Announcement: Tindaro Ioppolo

posted Jun 14, 2018, 6:54 AM by Stefano Varas   [ updated Jun 14, 2018, 6:54 AM ]

Announcement
Tuesday, 12 June 2018, 10:30
Sala Grande Palazzina B via alla Cascata 56/C

"All photonic microsensors based on whipering gallery mode resonators"

Tindaro Ioppolo
Bobby Lyle School of Engineering, Department of Mechanical Engineering,
Southern Methodist University Dallas, Texas, USA

Abstract
A Spherical and dome shaped resonators made of different polymers are used as a sensing element for mechanical applications. The sensing mechanism is based on the propagation of whispering gallery waves that are traveling into optical cavities. Tethered and untethered sensors will be presented. Tethered sensors are mainly spherical micro cavities that are coupled evanescently to a single mode optical fiber. The optical fiber serves as input output port to excite and interrogate the optical modes. Untethered sensors are essentially spherical or dome shaped microscale lasers that are excited using an external light source. The emission spectrum of the microscale laser is observed using a spectrometer. This last configuration allows for a remote excitation and interrogation of the optical modes. In both configurations, a change in the morphology of the micro cavity due to an external effect leads to a shift in its optical modes. The optical shift in turn is monitored and related to the external effect. Sensors based on this concept will be presented for different applications.

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Stefano Varas,
Jun 14, 2018, 6:54 AM