Visit by Professor Krishna Shenai - March 12 2008



Professor Krishna Shenai, the Chair person of the Electrical Department at the University of Toledo made a visit to SPIE at DCE, to give the students information regarding the various courses at the University of Toledo and discussed about the research endeavours being carried out there.
A zone plate is a device used to focus light. Unlike lenses however, zone plates use diffraction instead of refraction. Created by Augustin-Jean Fresnel, they are sometimes called Fresnel zone plates in his honor. The zone plate's focusing ability is an extension of the Arago spot phenomenon caused by diffraction from an opaque disc.