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Tethered/Untethered Micro Optical Cavity for Sensing Applications

Friday, May 5, 2017, 2:00 PM - 2:50 PM
Woolf Hall 402

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Mechanical and Aerospace Engineering Department Seminar

Tindaro Ioppolo, Ph.D.
Assistant Professor, Mechanical Engineering, SMU

Abstract: 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 galley waves that are traveling into optical cavities. 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.   

Ioppolo TindaroBio: Tindaro Ioppolo earned his Laurea Degree in aeronautical engineering from the University of Palermo and his Ph.D. in mechanical engineering from the Polytechnic University in 2008. After earning his Ph.D., he joined the Department of Mechanical Engineering at Southern Methodist University as a post-doctoral fellow. In 2012, he became an assistant professor in the department. He has authored more than 60 refereed archival publications and conference papers. His current research focuses on sensor development, interaction of wall turbulence with flexible walls, and water entry of objects. His research has been funded by the National Science Foundation, and NYSEARCH/NGA. Ioppolo has two patents and is a member of the American Institute of Aeronautics and Astronautics (AIAA), American Physics Society (APS) and the Society of Photo-Optical Instrumentation Engineers (SPIE).

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